Acne and Related Disorders — MCQs
On this page
What is the latest retinoid drug used in acne?
What are the treatment options for acne vulgaris?
An 18-year-old girl presents with predominantly comedonal acne. What is the first-line treatment?
What causes a potato tumor?
Which of the following is associated with hidradenitis suppurativa?
Which of the following drugs should not be used in the management of Rosacea?
Hypertrophy of the sebaceous glands in the nasal skin is called?
Benzoyl peroxide is effective in which of the following conditions?
What is the most common site for Necrobiosis Lipoidica Diabeticorum?
What is the primary treatment for nodulocystic acne?
Acne and Related Disorders Indian Medical PG Practice Questions and MCQs
Question 1: What is the latest retinoid drug used in acne?
- A. Retinoic acid
- B. Clindamycin
- C. Adapalane (Correct Answer)
- D. Azelaic acid
Explanation: **Explanation:** **Adapalane** is the correct answer as it represents a **third-generation topical retinoid**. Unlike first-generation retinoids, adapalane is a naphthoic acid derivative that selectively binds to **Retinoic Acid Receptors (RAR-β and RAR-γ)**. This selectivity, combined with its lipophilic nature, allows it to penetrate the pilosebaceous unit more effectively while causing significantly less skin irritation (redness and peeling) compared to older agents like Tretinoin. It is currently the standard "latest" generation retinoid frequently tested in this context for its stability and improved safety profile. **Analysis of Incorrect Options:** * **Retinoic acid (Tretinoin):** This is a **first-generation** retinoid. While highly effective, it is more photolabile (degrades in sunlight) and generally more irritating to the skin than Adapalane. * **Clindamycin:** This is a **topical antibiotic**, not a retinoid. It acts by inhibiting protein synthesis in *Cutibacterium acnes* but does not possess the comedolytic properties of retinoids. * **Azelaic acid:** This is a dicarboxylic acid with antibacterial and antikeratinizing properties. While used in acne (especially for post-inflammatory hyperpigmentation), it is **not a retinoid**. **High-Yield Clinical Pearls for NEET-PG:** * **Generations of Retinoids:** * 1st: Tretinoin, Isotretinoin. * 2nd: Etretinate, Acitretin (used in Psoriasis). * 3rd: Adapalane, Tazarotene. * 4th: **Trifarotene** (The most recent, highly selective for RAR-γ). * **Mechanism:** Retinoids are **comedolytic**; they normalize follicular keratinization to prevent microcomedone formation. * **Teratogenicity:** All oral retinoids are strictly contraindicated in pregnancy (Category X). Isotretinoin requires a mandatory contraception period (1 month post-discontinuation).
Question 2: What are the treatment options for acne vulgaris?
- A. Dapsone
- B. Oral Minocycline
- C. Isotretinoin
- D. All the above (Correct Answer)
Explanation: **Explanation:** Acne vulgaris is a chronic inflammatory disease of the pilosebaceous unit. Its management is multifaceted, targeting the four key pathogenic factors: follicular hyperkeratinization, sebum production, *Cutibacterium acnes* colonization, and inflammation. * **Dapsone (Option A):** Topical dapsone (5% or 7.5% gel) is an effective treatment, particularly for inflammatory acne in adult females. It possesses potent anti-inflammatory properties. While oral dapsone is rarely used for routine acne due to side effects, it remains a recognized systemic option for severe, recalcitrant variants like Acne Fulminans. * **Oral Minocycline (Option B):** This is a second-generation tetracycline and a mainstay for moderate-to-severe inflammatory acne. It is highly lipophilic, ensuring excellent penetration into the pilosebaceous unit. It acts by inhibiting protein synthesis in *C. acnes* and reducing chemotactic factors. * **Isotretinoin (Option C):** This oral retinoid is the "gold standard" for severe nodulocystic acne. It is the only drug that addresses all four pathogenic mechanisms of acne. Since all three medications are established therapeutic options, **Option D (All the above)** is the correct answer. **Clinical Pearls for NEET-PG:** * **Isotretinoin:** Highly teratogenic (Category X); requires two forms of contraception and monthly pregnancy tests (IPLEDGE program). It can cause dryness (cheilitis is the most common side effect) and elevated triglycerides. * **Minocycline Side Effects:** Can cause blue-grey skin pigmentation, vestibular toxicity (vertigo), and drug-induced lupus. * **First-line for Mild Acne:** Topical retinoids (Adapalene) + Benzoyl Peroxide. * **Acne Fulminans:** The most severe form; treated with systemic steroids followed by low-dose Isotretinoin.
Question 3: An 18-year-old girl presents with predominantly comedonal acne. What is the first-line treatment?
- A. Topical retinoids (Correct Answer)
- B. Systemic retinoids
- C. Systemic antibiotics
- D. Topical steroids
Explanation: **Explanation:** The primary goal in treating acne is to target the specific pathogenic mechanism involved. In this case, the patient presents with **predominantly comedonal acne** (non-inflammatory lesions). **1. Why Topical Retinoids are correct:** Topical retinoids (e.g., Adapalene, Tretinoin) are the **first-line treatment** for comedonal acne because they are potent **comedolytic agents**. They work by normalizing follicular keratinization, which prevents the formation of the microcomedo (the precursor to all acne lesions). They also possess mild anti-inflammatory properties, making them the foundation of maintenance therapy. **2. Why other options are incorrect:** * **Systemic retinoids (Isotretinoin):** These are reserved for severe, nodulocystic, or scarring acne, or cases refractory to conventional therapy. They are too aggressive for simple comedonal acne. * **Systemic antibiotics:** These are indicated for moderate-to-severe *inflammatory* acne (papules/pustules) to target *C. acnes* colonization. They have no significant comedolytic activity. * **Topical steroids:** These are **contraindicated** in acne. In fact, prolonged use of topical steroids can induce "steroid-induced acne," characterized by monomorphic papulopustular eruptions. **Clinical Pearls for NEET-PG:** * **Adapalene** is often preferred over Tretinoin due to better photostability and less skin irritation. * **First-line for Mild Inflammatory Acne:** Topical Retinoid + Topical Antimicrobial (e.g., Benzoyl Peroxide or Clindamycin). * **Side Effects:** Topical retinoids commonly cause "retinoid dermatitis" (dryness, erythema, and scaling). Patients should be advised to apply them at night and use sunscreen.
Question 4: What causes a potato tumor?
- A. Hypertrophy of sweat glands of the nose
- B. Hypertrophy of sebaceous glands of the nose (Correct Answer)
- C. Hypotrophy of sweat glands of the nose
- D. All of the above
Explanation: **Explanation:** The term **"Potato Tumor"** is a clinical synonym for **Rhinophyma**, which represents the end-stage (Phymatous stage) of **Rosacea**. **1. Why Option B is Correct:** Rhinophyma is characterized by the progressive **hypertrophy and hyperplasia of the sebaceous glands** on the nose. This chronic inflammatory process leads to the deposition of fibrous tissue and an increase in connective tissue volume. Clinically, this results in a bulbous, irregular, and "potato-like" enlargement of the nose with prominent follicular pits. It is most commonly seen in elderly males. **2. Why Other Options are Incorrect:** * **Option A & C:** Rhinophyma specifically involves the pilosebaceous unit (sebaceous glands), not the eccrine or apocrine sweat glands. While the nose contains sweat glands, they do not undergo the massive hypertrophy required to produce a phymatous change. * **Option D:** Since the pathology is specific to sebaceous gland hypertrophy, "All of the above" is incorrect. **Clinical Pearls for NEET-PG:** * **Rosacea Stages:** Erythematotelangiectatic (flushing), Papulopustular, Phymatous (Rhinophyma), and Ocular rosacea. * **Demographics:** While Rosacea is more common in females, **Rhinophyma is significantly more common in males** (Male:Female ratio approx. 20:1). * **Misconception:** Historically, rhinophyma was falsely linked to chronic alcoholism ("rum nose"); however, alcohol is merely a trigger for flushing, not the primary cause. * **Treatment:** Early stages are treated with topical metronidazole or oral isotretinoin. Advanced Rhinophyma (Potato Tumor) usually requires **surgical intervention** (CO2 laser or dermabrasion) to reshape the nose.
Question 5: Which of the following is associated with hidradenitis suppurativa?
- A. Lung
- B. Breast (Correct Answer)
- C. Uterus
- D. Kidney
Explanation: **Explanation:** **Hidradenitis Suppurativa (HS)**, also known as **Acne Inversa**, is a chronic inflammatory skin condition characterized by recurrent, painful nodules, abscesses, and sinus tracts. The primary pathology involves follicular occlusion of the pilosebaceous unit, particularly in intertriginous areas rich in apocrine glands. **Why Breast is the correct answer:** The **breast** (specifically the inframammary fold and the periareolar area) is one of the most common sites for HS, especially in females. HS characteristically involves the "milk line" distribution. Other classic sites include the axilla (most common), groin, perineum, and perianal regions. The chronic inflammation in the breast area can sometimes mimic mastitis or even malignancy, making it a high-yield clinical association. **Why other options are incorrect:** * **Lung, Uterus, and Kidney:** These are internal visceral organs. HS is a disease of the follicular epithelium of the skin. While HS is associated with systemic inflammation and various comorbidities (like metabolic syndrome or inflammatory bowel disease), it does not primarily involve or originate in the lungs, uterus, or kidneys. **High-Yield Clinical Pearls for NEET-PG:** * **Hurley Staging System:** Used to grade the severity of HS (Stage I: Abscess without sinus tracts; Stage II: Recurrent abscesses with sinus tracts and scarring; Stage III: Diffuse involvement with interconnected tracts). * **Follicular Occlusion Tetrad:** HS often co-occurs with Acne Conglobata, Dissecting Cellulitis of the scalp, and Pilonidal Sinus. * **Risk Factors:** Smoking and Obesity are the most significant triggers/exacerbating factors. * **Treatment:** Lifestyle modification (weight loss, smoking cessation), topical/oral antibiotics (Clindamycin + Rifampicin), and TNF-alpha inhibitors (Adalimumab is FDA-approved). Surgical excision is required for chronic sinus tracts.
Question 6: Which of the following drugs should not be used in the management of Rosacea?
- A. Isotretinoin
- B. Metronidazole
- C. Corticosteroids (Correct Answer)
- D. Benzoyl peroxide
Explanation: **Explanation:** **Corticosteroids (Option C)** are contraindicated in the management of Rosacea because they can lead to a condition known as **Steroid-induced Rosacea**. While topical steroids may provide temporary symptomatic relief due to their anti-inflammatory properties, their prolonged use causes rebound vasodilation, skin atrophy, and the development of telangiectasia. Most importantly, they trigger the eruption of inflammatory papules and pustules, severely worsening the underlying disease. **Analysis of Incorrect Options:** * **Isotretinoin (Option A):** Low-dose oral isotretinoin is an effective second-line treatment for refractory or phymatous rosacea. It works by reducing sebaceous gland size and downregulating inflammatory pathways. * **Metronidazole (Option B):** Topical metronidazole (0.75% or 1%) is the **gold standard** first-line topical treatment for papulopustular rosacea due to its potent anti-inflammatory and antioxidant effects. * **Benzoyl peroxide (Option D):** Though potentially irritating, it is used (often in combination with clindamycin or encapsulated formulations) for its antimicrobial properties in treating the inflammatory lesions of rosacea. **High-Yield Clinical Pearls for NEET-PG:** * **First-line Topical:** Metronidazole or Azelaic acid. * **First-line Systemic:** Oral Tetracyclines (Doxycycline is preferred at sub-antimicrobial doses, e.g., 40mg). * **Erythematotelangiectatic Rosacea:** Best treated with topical Brimonidine (alpha-2 agonist) for vasoconstriction. * **Phymatous Rosacea:** Characterized by sebaceous hyperplasia (e.g., Rhinophyma); managed with Isotretinoin or surgical CO2 laser resurfacing. * **Key Trigger:** Demodex folliculorum (mite) is often implicated in the pathogenesis.
Question 7: Hypertrophy of the sebaceous glands in the nasal skin is called?
- A. Rhinodporidiosis
- B. Rhinophyma (Correct Answer)
- C. Rhinolith
- D. Rhinorrhoea
Explanation: **Explanation:** **Rhinophyma** is the correct answer. It represents the end-stage of **Phymatous Rosacea**, characterized by the hypertrophy of sebaceous glands, connective tissue hyperplasia, and vascular proliferation in the nasal skin. This results in a bulbous, irregular, and "pitted" appearance of the nose, often described as a "strawberry nose." While Rosacea is more common in women, Rhinophyma occurs almost exclusively in men over the age of 40. **Analysis of Incorrect Options:** * **Rhinosporidiosis:** A chronic granulomatous infection caused by *Rhinosporidium seeberi* (a Mesomycetozoea). It typically presents as friable, leafy, or strawberry-like vascular polyps on the nasal mucosa, not as sebaceous hypertrophy. * **Rhinolith:** A "nose stone" formed by the deposition of mineral salts (calcium and magnesium) around a foreign body nidus within the nasal cavity. * **Rhinorrhoea:** A clinical symptom referring to the free discharge of thin nasal mucus (commonly known as a "runny nose"). **High-Yield Clinical Pearls for NEET-PG:** * **Rosacea Stages:** It progresses through Erythematotelangiectatic, Papulopustular, Phymatous, and Ocular stages. * **Triggers:** Alcohol, spicy foods, sunlight, and hot beverages can exacerbate Rosacea (flushing). * **Treatment:** Early stages are managed with topical Metronidazole or Azelaic acid. Rhinophyma (the phymatous stage) usually requires surgical correction, such as CO2 laser resurfacing or electrosurgery, as medical therapy is ineffective for established hypertrophy. * **Demodex folliculorum:** This mite is often implicated in the pathogenesis of Rosacea.
Question 8: Benzoyl peroxide is effective in which of the following conditions?
- A. Acne (Correct Answer)
- B. Psoriasis
- C. Contact dermatitis
- D. Tinea
Explanation: **Explanation:** **Benzoyl Peroxide (BPO)** is a first-line topical treatment for **Acne Vulgaris**. Its efficacy is attributed to three primary mechanisms: 1. **Bactericidal Action:** It releases singlet oxygen species that kill *Cutibacterium acnes* (formerly *P. acnes*). Unlike antibiotics, it does not induce bacterial resistance. 2. **Comedolytic Action:** It helps clear pores by reducing follicular hyperkeratosis. 3. **Anti-inflammatory Action:** It reduces the free fatty acid content in sebum, decreasing skin irritation. **Analysis of Incorrect Options:** * **B. Psoriasis:** This is a T-cell mediated autoimmune inflammatory condition characterized by keratinocyte hyperproliferation. Treatment involves topical steroids, Vitamin D analogues (Calcipotriol), or systemic biologics. BPO has no role here and may cause irritation. * **C. Contact Dermatitis:** This is an inflammatory reaction to allergens or irritants. Treatment focuses on identifying the trigger and using topical corticosteroids or emollients. BPO is actually a known cause of **allergic contact dermatitis** in some patients. * **D. Tinea:** This is a fungal infection (dermatophytosis) requiring antifungal agents like Clotrimazole or Terbinafine. BPO lacks antifungal properties. **High-Yield Clinical Pearls for NEET-PG:** * **Resistance:** BPO is often combined with topical antibiotics (e.g., Clindamycin) to **prevent the development of antibiotic resistance**. * **Side Effects:** The most common side effects are dryness, erythema, and **bleaching of hair and fabrics** (clothing/bedsheets). * **Pregnancy:** It is generally considered safe (Category C) but should be used with caution.
Question 9: What is the most common site for Necrobiosis Lipoidica Diabeticorum?
- A. Face
- B. Neck
- C. Leg (Correct Answer)
- D. Ankle
Explanation: **Explanation:** **Necrobiosis Lipoidica (NL)**, formerly known as Necrobiosis Lipoidica Diabeticorum, is a chronic granulomatous skin disorder characterized by collagen degeneration and granuloma formation. **Why the Leg is Correct:** The **pretibial area (shins)** is the most common site, involved in approximately **85% of cases**. The lesions typically present as well-circumscribed, firm, depressed, waxy, yellow-brown plaques with prominent telangiectasia and an "apple-jelly" hue. The skin in this area is prone to microvascular changes and minor trauma, which are thought to contribute to the pathogenesis. **Why Other Options are Incorrect:** * **Face & Neck:** While NL can occur in extra-pretibial sites (15% of cases), involvement of the face and neck is extremely rare. These areas are more common for other granulomatous conditions like *Granuloma Annulare*. * **Ankle:** Although lesions can extend toward the ankle, the primary and most frequent site of onset remains the anterior surface of the lower leg (shins). **High-Yield Clinical Pearls for NEET-PG:** * **Association with Diabetes:** Only about 0.3% of diabetic patients develop NL, but **65% of patients with NL have diabetes**. It is more common in Type 1 DM and in females. * **Pathology:** Look for "tiered" or "sandwich" granulomas in the dermis involving collagen necrobiosis. * **Koebner Phenomenon:** NL can exhibit the Koebner phenomenon (lesions appearing at sites of trauma). * **Complication:** The most serious complication is the development of **Squamous Cell Carcinoma** within chronic, ulcerated NL lesions. * **Treatment:** First-line therapy includes potent topical or intralesional corticosteroids.
Question 10: What is the primary treatment for nodulocystic acne?
- A. Steroids
- B. Antibiotics
- C. Isotretinoin (Correct Answer)
- D. Antifungals
Explanation: ### Explanation **Correct Answer: C. Isotretinoin** **Why Isotretinoin is the Right Choice:** Nodulocystic acne is the most severe form of acne vulgaris, characterized by deep-seated inflammatory nodules and cysts that carry a high risk of permanent scarring and psychological distress. **Oral Isotretinoin (13-cis-retinoic acid)** is considered the gold standard and first-line treatment for this condition. It is the only drug that targets all four pathogenic factors of acne: 1. Hyperkeratinization (normalizes follicular desquamation). 2. Sebum production (induces atrophy of sebaceous glands). 3. *Cutibacterium acnes* proliferation (by altering the microenvironment). 4. Inflammation. **Analysis of Incorrect Options:** * **A. Steroids:** While systemic or intralesional steroids may be used as an adjunct to reduce acute inflammation or manage "acne fulminans," they are not the primary curative treatment. * **B. Antibiotics:** Oral antibiotics (like Doxycycline) are effective for moderate inflammatory acne but are generally insufficient as monotherapy for nodulocystic cases and do not provide long-term remission. * **D. Antifungals:** These are used for *Pityrosporum* folliculitis (fungal acne), not for conventional acne vulgaris. **Clinical Pearls for NEET-PG:** * **Teratogenicity:** Isotretinoin is highly teratogenic (Category X). Female patients must follow the **iPLEDGE** program or similar protocols, requiring two forms of contraception and monthly pregnancy tests. * **Monitoring:** Baseline and periodic checks of **Liver Function Tests (LFTs)** and **Lipid profile** (specifically Triglycerides) are mandatory. * **Side Effects:** The most common side effect is **cheilitis** (dry lips). It is also associated with secondary psychiatric symptoms and night blindness. * **Dosage:** The standard cumulative dose for remission is **120–150 mg/kg**.
Practice by Chapter
Acne Vulgaris: Pathophysiology
Practice Questions
Acne Vulgaris: Clinical Types
Practice Questions
Acne Vulgaris: Management
Practice Questions
Acne in Special Populations
Practice Questions
Rosacea
Practice Questions
Perioral Dermatitis
Practice Questions
Hidradenitis Suppurativa
Practice Questions
Acne Keloidalis Nuchae
Practice Questions
Acne Scarring and Its Management
Practice Questions
Psychological Aspects of Acne
Practice Questions
Diet and Acne
Practice Questions
Newer Therapies in Acne Management
Practice Questions
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free