Acne Keloidalis Nuchae — MCQs
Consider the following causes of alopecia: 1. Androgenetic alopecia 2. Alopecia areata 3. Telogen effluvium 4. Lichen planopilaris. Which among the following causes non-scarring alopecia?
Which of the following best describes the current understanding of rosacea pathogenesis?
Recalcitrant acne is treated by:
Eosinophilic pustular folliculitis is a rare form of folliculitis that is seen with increased frequency in patients with what?
Which of the following statements about keloids is MOST true?
Loss of lateral 1/3rd of eyebrow is seen in -
A 24-year-old woman presents with multiple nodular, cystic, and pustular lesions on her face and shoulders for 2 years. What is the drug of choice for her treatment?
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?
Acne Keloidalis Nuchae Indian Medical PG Practice Questions and MCQs
Question 1: Consider the following causes of alopecia: 1. Androgenetic alopecia 2. Alopecia areata 3. Telogen effluvium 4. Lichen planopilaris. Which among the following causes non-scarring alopecia?
- A. 1, 2 and 3 (Correct Answer)
- B. Only 4
- C. 3 and 4
- D. 2, 3 and 4
Explanation: **1, 2, and 3** - **Androgenetic alopecia**, **alopecia areata**, and **telogen effluvium** are all forms of **non-scarring alopecia**, meaning the hair follicles are primarily affected without permanent destruction. - In these conditions, there is potential for hair regrowth as the follicular structures remain intact. *Only 4* - **Lichen planopilaris** is a type of **scarring alopecia**, characterized by permanent destruction of hair follicles and replacement with fibrous tissue. - This leads to irreversible hair loss in the affected areas. *3 and 4* - While **telogen effluvium** causes non-scarring alopecia, **lichen planopilaris** is a scarring alopecia. - Therefore, this option incorrectly groups a non-scarring and a scarring condition. *2, 3, and 4* - This option correctly identifies **alopecia areata** and **telogen effluvium** as non-scarring but incorrectly includes **lichen planopilaris**, which results in scarring alopecia. - **Lichen planopilaris** has inflammatory infiltrates that lead to permanent follicular damage.
Question 2: Which of the following best describes the current understanding of rosacea pathogenesis?
- A. Primarily caused by increased sebum production similar to acne vulgaris
- B. Solely due to increased reactivity of cutaneous blood vessels to vasodilators
- C. Multifactorial etiology with no single definitive cause established (Correct Answer)
- D. Results from bacterial infection affecting the entire face and back
Explanation: ***Multifactorial etiology with no single definitive cause established*** - Rosacea is understood to arise from complex interactions between **genetic predisposition**, **environmental triggers**, **immune dysregulation**, and **neurovascular dysfunction**. - No single factor fully explains its development; rather, it's a **synergistic interplay** of multiple pathways. *Primarily caused by increased sebum production similar to acne vulgaris* - While sebaceous glands can be affected in phymatous rosacea, **increased sebum production** is the primary driver of **acne vulgaris**, not rosacea. - Rosacea is fundamentally a disorder of **neurovascular and immune dysregulation**, not primarily of follicular obstruction or sebum overproduction. *Solely due to increased reactivity of cutaneous blood vessels to vasodilators* - While **vascular dysfunction** and increased reactivity to vasodilators are significant components of rosacea, they are not the sole causative factor. - **Inflammation**, genetic factors, and immune system involvement also play crucial roles. *Results from bacterial infection affecting the entire face and back* - Rosacea is not solely caused by a **bacterial infection**, although the **skin microbiome** (e.g., *Demodex mites*, *Bacillus oleronius*) may contribute to inflammation in some cases. - Unlike conditions like **acne**, which is linked to *Cutibacterium acnes*, rosacea is not considered a primary bacterial infection.
Question 3: Recalcitrant acne is treated by:
- A. Steroids
- B. Retinoids (Correct Answer)
- C. Oral erythromycin
- D. Oral tetracycline
Explanation: ***Retinoids*** - **Oral retinoids**, particularly **isotretinoin**, are highly effective for **recalcitrant, severe acne** that has not responded to conventional therapies. - They work by reducing **sebum production**, inhibiting **Propionibacterium acnes**, normalizing **follicular keratinization**, and possessing **anti-inflammatory** properties. *Steroids* - **Systemic steroids** are generally not used for long-term acne treatment due to significant side effects and the potential for **steroid-induced acne**. - They may be used short-term for **severe nodulocystic acne** with significant inflammation, but not as a primary treatment for recalcitrance. *Oral erythromycin* - **Oral erythromycin** is an antibiotic sometimes used for acne, but resistance is common, limiting its effectiveness, especially in **recalcitrant cases**. - It primarily targets **Propionibacterium acnes** and has some **anti-inflammatory** effects, but is less potent than retinoids for severe, persistent acne. *Oral tetracycline* - **Oral tetracyclines** (e.g., doxycycline, minocycline) are commonly used for moderate to severe acne, but if acne is **recalcitrant**, it indicates a lack of response to these antibiotics. - Their mechanism involves reducing **bacterial growth** and inflammation, but they do not address the underlying pathogenesis of severe acne as comprehensively as retinoids.
Question 4: Eosinophilic pustular folliculitis is a rare form of folliculitis that is seen with increased frequency in patients with what?
- A. ABPA
- B. Asthma
- C. Leukemia cutis
- D. HIV infection (Correct Answer)
Explanation: ***HIV infection*** - Eosinophilic pustular folliculitis, also known as **Ofuji's disease**, is a pruritic skin condition commonly seen in patients with **advanced HIV disease**. - Its exact pathogenesis is unknown, but it is thought to be an immune dysregulation phenomenon related to the **CD4 count decline** seen in HIV. - The condition presents as recurrent crops of sterile, pruritic follicular papules and pustules, particularly on the face, trunk, and extremities. *ABPA* - **Allergic bronchopulmonary aspergillosis (ABPA)** is a hypersensitivity reaction to *Aspergillus* species, primarily affecting the lungs. - It is characterized by **eosinophilia**, but it does not cause eosinophilic pustular folliculitis. - ABPA is associated with asthma and cystic fibrosis. *Asthma* - **Asthma** is a chronic inflammatory disease of the airways, characterized by **bronchial hyperresponsiveness** and reversible airflow obstruction. - While asthma can involve eosinophilic inflammation of the airways, it is not directly associated with eosinophilic pustular folliculitis. *Leukemia cutis* - **Leukemia cutis** refers to the infiltration of the skin by leukemic cells, often presenting as nodules, plaques, or papules. - This condition is a direct manifestation of leukemia and is biologically distinct from eosinophilic pustular folliculitis.
Question 5: Which of the following statements about keloids is MOST true?
- A. Keloids may extend beyond the original wound. (Correct Answer)
- B. Extended excision is often not the treatment of choice.
- C. It contains growth factors.
- D. None of the options.
Explanation: ***Keloids may extend beyond the original wound.*** - Keloids are characterized by their **overgrowth** beyond the boundaries of the original injury. - This distinguishes them from **hypertrophic scars**, which remain confined to the wound edges. *Extended excision is often not the treatment of choice.* - **Excision alone** is usually insufficient for keloids and can even be counterproductive, as the recurring wound often leads to a larger keloid. - While excision can be part of a treatment plan, it is typically combined with supplementary therapies like **steroid injections** or **radiation therapy** to prevent recurrence. *It contains growth factors.* - While keloids involve abnormal fibroblast activity and deposition of **extracellular matrix**, the statement that it "contains growth factors" is too vague and not a defining characteristic that differentiates it from a range of other tissues or conditions. - Many tissues and healing processes involve growth factors, so this statement alone does not provide a specific or most true characteristic of keloids. *None of the options.* - This option is incorrect because the statement that **keloids may extend beyond the original wound** is a hallmark characteristic of keloids and is definitively true.
Question 6: Loss of lateral 1/3rd of eyebrow is seen in -
- A. Tetanus
- B. Tinea capitis
- C. Lepromatous leprosy (Correct Answer)
- D. Tuberculosis
Explanation: ***Lepromatous leprosy*** - **Loss of the lateral one-third of the eyebrow** (also known as **madarosis**) is a characteristic feature of **lepromatous leprosy** due to chronic inflammation and nerve damage affecting hair follicles. - This, along with diffuse skin infiltration and nodule formation, is part of the typical presentation of the **multibacillary form** of the disease. *Tetanus* - Tetanus is characterized by **muscle spasms** and **lockjaw** due to the action of tetanus toxin on inhibitory neurotransmitters. - It does not cause hair loss or specific dermatological lesions like eyebrow loss. *Tinea capitis* - Tinea capitis is a **fungal infection of the scalp** that causes scaling, itching, and patchy hair loss on the head. - It does not typically affect the eyebrows or cause isolated loss of the lateral one-third part. *Tuberculosis* - Tuberculosis primarily affects the **lungs** but can manifest in various extrapulmonary sites. - While systemic symptoms and skin lesions (e.g., **lupus vulgaris**) can occur, **eyebrow loss** is not a characteristic feature of tuberculosis.
Question 7: A 24-year-old woman presents with multiple nodular, cystic, and pustular lesions on her face and shoulders for 2 years. What is the drug of choice for her treatment?
- A. Isotretinoin (Correct Answer)
- B. Azithromycin
- C. Doxycycline
- D. Acitretin
Explanation: ***Isotretinoin*** - This patient presents with **severe nodulocystic acne**, characterized by multiple nodular, cystic, and pustular lesions, which is the primary indication for oral isotretinoin. - Isotretinoin is a potent systemic retinoid that **reduces sebum production**, inhibits _Propionibacterium acnes_, normalizes keratinization, and has anti-inflammatory effects, leading to significant and often long-term remission. *Azithromycin* - Azithromycin is an **antibiotic** that can be used for inflammatory acne, but it is typically reserved for patients who cannot tolerate or are resistant to other tetracycline-class antibiotics. - While it has anti-inflammatory properties, it is generally **less effective for severe nodulocystic acne** compared to isotretinoin. *Doxycycline* - Doxycycline is a **tetracycline antibiotic** commonly used for moderate to severe inflammatory acne due to its anti-inflammatory effects and ability to reduce _P. acnes_ bacteria. - However, for **severe nodulocystic acne**, systemic antibiotics like doxycycline are often insufficient as monotherapy and **isotretinoin is the preferred treatment** for its superior efficacy in such cases. *Acitretin* - Acitretin is a systemic retinoid primarily used for **severe psoriasis** and other keratinization disorders. - It is **not indicated for the treatment of acne** and has a different safety profile and mechanism of action compared to isotretinoin.
Question 8: 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 9: 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 10: 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.
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