Acne in Childhood and Adolescence — MCQs
A 40 year old woman presents with a 2 year history of erythematous papulopustular lesions on convexities of the face. There is a background of erythema & telangiectasia. The most likely diagnosis is –
Which of the following are treatment options for acne vulgaris?
Recalcitrant acne is treated by:
An adolescent male presents with severe acne lesions and sinus tracts. Which is the most effective drug for this condition?
Which of the following is a primary causative factor for acne?
A 15cm hyperpigmented macule on an adolescent male undergoes changes such as coarseness, growth of hair & acne. Diagnosis is?
An 18-year-old man has facial and upper back lesions that have waxed and waned for the past 6 years. On physical examination, there are 0.3- to 0.9-cm comedones, erythematous papules, nodules, and pustules most numerous on the lower face and posterior upper trunk. Other family members have been affected by this condition at a similar age. The lesions worsen during a 5-day cruise to the Adriatic. Which of the following organisms is most likely to play a key role in the pathogenesis of these lesions?
Which of the following statements is not correct regarding sebaceous cyst?
What is the treatment for granuloma inguinale?
A child presents with a history of hypopigmented macules on the back, infantile spasms, and delayed milestones. What is the most likely diagnosis?
Acne in Childhood and Adolescence Indian Medical PG Practice Questions and MCQs
Question 1: A 40 year old woman presents with a 2 year history of erythematous papulopustular lesions on convexities of the face. There is a background of erythema & telangiectasia. The most likely diagnosis is –
- A. Polymorphic light eruption
- B. Acne vulgaris
- C. Acne rosacea (Correct Answer)
- D. SLE
Explanation: ***Acne rosacea*** - This condition presents with **erythematous papulopustular lesions**, background **erythema**, and **telangiectasias** predominantly on the convexities of the face, which is a classic presentation for rosacea. - The absence of **comedones** (blackheads/whiteheads) helps differentiate it from acne vulgaris. *Polymorphic light eruption* - This is a recurring skin rash triggered by **sun exposure**, presenting as itchy papules, plaques, or vesicles, usually appearing a few hours after exposure. - Unlike rosacea, it does not typically feature permanent facial erythema or telangiectasias and is more directly linked to UV exposure episodes. *Acne vulgaris* - While it features papules and pustules, **acne vulgaris** is characterized by the presence of **comedones** (blackheads and whiteheads), which are not described in the patient's presentation. - It also does not typically involve the prominent background erythema and telangiectasias seen in rosacea. *SLE* - Systemic lupus erythematosus (SLE) can cause a **malar or 'butterfly' rash** across the nose and cheeks, but it is typically a fixed erythema, sometimes with scaling, and does not usually involve papulopustular lesions or telangiectasias as a primary feature. - SLE often has systemic symptoms (e.g., joint pain, fatigue) that are not mentioned, and skin lesions can be photosensitive but are not typically pustular.
Question 2: Which of the following are treatment options for acne vulgaris?
- A. Isotretinoin
- B. All of the options (Correct Answer)
- C. Topical erythromycin
- D. Oral Minocycline
Explanation: ***All of the options*** - All listed options (Isotretinoin, Topical erythromycin, and Oral Minocycline) are well-established and commonly used **treatment options for acne vulgaris**, depending on the severity and type of acne. - The choice of treatment often follows a stepped approach, starting with topical agents for mild to moderate acne and progressing to oral medications like antibiotics or isotretinoin for more severe or resistant cases. *Isotretinoin* - **Isotretinoin** is a powerful oral retinoid primarily used for **severe, recalcitrant nodular acne** that has not responded to other treatments. - It works by reducing sebum production, follicular hyperkeratinization, inflammation, and the growth of *P. acnes*. *Topical erythromycin* - **Topical erythromycin** is an **antibiotic** used to treat mild to moderate inflammatory acne by reducing the growth of *Cutibacterium acnes* (formerly *Propionibacterium acnes*) and decreasing inflammation. - It is often combined with other topical agents like benzoyl peroxide to minimize the development of **antibiotic resistance**. *Oral Minocycline* - **Oral minocycline** is a **tetracycline antibiotic** used for moderate to severe inflammatory acne. - It reduces bacterial populations on the skin and exhibits **anti-inflammatory properties**, making it effective for widespread or deeper lesions.
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: An adolescent male presents with severe acne lesions and sinus tracts. Which is the most effective drug for this condition?
- A. Minocycline
- B. Doxycycline
- C. Isotretinoin (Correct Answer)
- D. Topical dapsone
Explanation: ***Isotretinoin*** - This patient presents with **severe acne**, likely cystic or nodular, given the mention of "sinus tracts," which often correlates with **acne conglobata**. - **Isotretinoin** is the most effective treatment for severe acne as it targets all four pathogenic factors of acne: **sebaceous gland activity**, **follicular hyperkeratinization**, *C. acnes* proliferation, and inflammation. *Minocycline* - Minocycline is an **oral antibiotic** used for moderate to severe inflammatory acne, primarily due to its anti-inflammatory properties and ability to reduce *C. acnes*. - While effective for some inflammatory acne, it is **less effective than isotretinoin** for severe, nodulocystic acne or acne with sinus tracts and is not a definitive cure. *Doxycycline* - Doxycycline is another **oral tetracycline antibiotic** commonly used for moderate to severe inflammatory acne due to its anti-inflammatory effects and reduction of *C. acnes*. - Similar to minocycline, it is a good option for inflammatory acne but **insufficient for very severe, recalcitrant acne** with sinus tracts, where isotretinoin is superior. *Topical dapsone* - Topical dapsone is an **anti-inflammatory agent** primarily used for mild to moderate inflammatory acne, particularly papules and pustules. - It is **not effective for severe nodulocystic acne** or acne associated with sinus tracts and would not be appropriate as monotherapy for this presentation.
Question 5: Which of the following is a primary causative factor for acne?
- A. Cutibacterium acnes
- B. Androgen (Correct Answer)
- C. Keratin
- D. Diet alone
Explanation: ***Androgen*** - **Androgens** significantly stimulate the **sebaceous glands** to produce more sebum, which is a primary factor in the development of **acne**. - Increased sebum production, combined with follicular hyperkeratinization, creates an environment conducive to the growth of **Cutibacterium acnes** and subsequent inflammation. - Androgens are considered one of the **four primary pathogenic pillars** of acne vulgaris. *Cutibacterium acnes* - **Cutibacterium acnes** (formerly *Propionibacterium acnes*) is a commensal bacterium that proliferates in the sebum-rich, anaerobic environment of clogged follicles. - While it contributes to **inflammation** and is essential in acne pathogenesis, bacterial colonization is **secondary to** the initial processes of increased sebum production and follicular obstruction driven by androgens. - Antibacterial therapy helps manage acne but doesn't address the primary hormonal trigger. *Keratin* - **Keratin** is a protein that plays a role in the formation of acne via **follicular hyperkeratinization**, leading to clogged pores. - However, the increased production of keratinized cells is often secondary to androgenic stimulation and inflammatory processes, making it a contributing factor rather than the sole primary cause. *Diet alone* - While certain **dietary factors** (e.g., high glycemic index foods, dairy) are implicated in exacerbating acne for some individuals, diet is generally considered a **modulatory factor** rather than a primary causative one. - Acne is a complex multifactorial condition, and diet alone rarely accounts for its primary onset without other hormonal or genetic influences.
Question 6: A 15cm hyperpigmented macule on an adolescent male undergoes changes such as coarseness, growth of hair & acne. Diagnosis is?
- A. Melanocytic nevus
- B. Becker nevus (Correct Answer)
- C. Sebaceous nevus
- D. Sebaceous adenoma
Explanation: ***Becker nevus*** - A Becker nevus is a **hyperpigmented patch** that typically appears during adolescence in males, often on the shoulder or upper trunk. - It characteristically becomes **hairy (hypertrichosis)**, more coarse, and can develop acne within the lesion, particularly during puberty due to androgen sensitivity. *Melanocytic nevus* - While melanocytic nevi are hyperpigmented, they generally do not show the characteristic changes of **coarseness, significant hair growth, or acne** within the lesion during adolescence. - They are typically stable in size and texture after initial development, with changes raising concern for **melanoma**. *Sebaceous nevus* - A sebaceous nevus is a **congenital lesion** often appearing as a yellowish-orange, waxy, or bumpy patch, usually on the scalp or face. - It does not typically present as a large, flat hyperpigmented macule that develops hair and acne in adolescence; instead, it may become verrucous or develop tumors in adulthood. *Sebaceous adenoma* - A sebaceous adenoma is a **benign tumor** of the sebaceous glands, usually appearing as a small, solitary, flesh-colored to yellowish papule or nodule, especially on the face. - It is not typically seen as a large, hyperpigmented macule that grows hair and acne over a broad area, as described in the question.
Question 7: An 18-year-old man has facial and upper back lesions that have waxed and waned for the past 6 years. On physical examination, there are 0.3- to 0.9-cm comedones, erythematous papules, nodules, and pustules most numerous on the lower face and posterior upper trunk. Other family members have been affected by this condition at a similar age. The lesions worsen during a 5-day cruise to the Adriatic. Which of the following organisms is most likely to play a key role in the pathogenesis of these lesions?
- A. Propionibacterium acnes (Correct Answer)
- B. Herpes simplex virus type 1
- C. Group A β-hemolytic streptococcus
- D. Mycobacterium leprae
Explanation: ***Propionibacterium acnes*** (now *Cutibacterium acnes*) - The presence of **comedones, papules, nodules, and pustules** on the face and upper back in an 18-year-old is classic for **acne vulgaris**. - **_P. acnes_** is a commensal bacterium that proliferates in clogged hair follicles, contributing to inflammation and lesion formation in acne due to its lipolytic activity and immune-activating properties. *Herpes simplex virus type 1* - **HSV-1** typically causes **oral herpes (cold sores)** or **genital herpes**, characterized by painful vesicles and ulcers. - The described lesions (comedones, papules, nodules, pustules) are not characteristic of HSV-1 infection. *Group A β-hemolytic streptococcus* - **Group A Strep** causes infections like **pharyngitis (strep throat)**, **impetigo**, or **cellulitis**, which are typically acute and rapidly spreading. - Its presence is not associated with chronic, polymorphic lesions characteristic of acne. *Mycobacterium leprae* - **_M. leprae_** is the causative agent of **leprosy**, presenting with skin lesions, nerve damage, and other systemic effects. - The skin lesions of leprosy are typically macules, papules, or nodules with sensory loss, not the comedones and pustules seen in acne.
Question 8: Which of the following statements is not correct regarding sebaceous cyst?
- A. Found on hairy areas of the body
- B. Treatment is incision and drainage (Correct Answer)
- C. Not found on palms and soles
- D. It has a punctum
Explanation: ***Treatment is incision and drainage*** - The standard treatment for a sebaceous cyst (more accurately an **epidermoid cyst** or **pilar cyst**) is **surgical excision** of the entire cyst wall to prevent recurrence. - **Incision and drainage** only provides temporary relief by emptying the contents but leaves the cyst wall intact, leading to a high chance of the cyst refilling. *Found on hairy areas of the body* - This statement is generally correct as sebaceous cysts often arise from hair follicles and are common in **hair-bearing areas** like the scalp, face, neck, and trunk. - They occur due to the accumulation of **sebum** and keratin within a blocked or damaged sebaceous gland or hair follicle. *Not found on palms and soles* - This statement is correct because **palms and soles** generally **lack sebaceous glands** and hair follicles, hence sebaceous cysts are typically not found in these locations. - Cysts found in these areas are more likely to be **ganglion cysts** or other types of epidermal inclusion cysts. *It has a punctum* - This statement is often correct; many sebaceous cysts (especially epidermoid cysts) have a visible **central punctum** which represents the occluded pore from which the cyst originated. - This punctum is a **key diagnostic feature** and can sometimes exude a cheesy, foul-smelling material.
Question 9: What is the treatment for granuloma inguinale?
- A. Tetracycline
- B. Azithromycin (Correct Answer)
- C. Clarithromycin
- D. Streptomycin
Explanation: ***Azithromycin*** - **Azithromycin** is the recommended first-line treatment for **granuloma inguinale** (donovanosis) caused by *Klebsiella granulomatis*. - Current recommended regimens: **Azithromycin 1g orally once weekly** OR **500mg daily for at least 3 weeks** (until all lesions have completely healed). - Preferred due to excellent tissue penetration, good efficacy, and convenient dosing that improves patient compliance. *Tetracycline* - **Tetracycline** (500mg four times daily) was historically used but has been largely replaced by **doxycycline** (100mg twice daily) as the preferred tetracycline-class antibiotic. - While effective against *Klebsiella granulomatis*, it requires frequent dosing leading to poor adherence. - **Doxycycline** (not listed here) is actually considered a co-first-line option alongside azithromycin in current CDC guidelines. *Clarithromycin* - **Clarithromycin** is a macrolide antibiotic but is not a recommended first-line agent for granuloma inguinale. - Limited clinical data supports its use for this condition, and it is not included in standard treatment guidelines. - Azithromycin from the same macrolide class is preferred due to better-established efficacy. *Streptomycin* - **Streptomycin** is an aminoglycoside antibiotic primarily used for mycobacterial infections (e.g., tuberculosis, plague). - Not indicated for granuloma inguinale as *Klebsiella granulomatis* responds well to macrolides (azithromycin) and tetracyclines (doxycycline). - Requires parenteral administration and has significant toxicity concerns (ototoxicity, nephrotoxicity).
Question 10: A child presents with a history of hypopigmented macules on the back, infantile spasms, and delayed milestones. What is the most likely diagnosis?
- A. Neurofibromatosis
- B. Sturge-Weber syndrome
- C. Tuberous sclerosis (Correct Answer)
- D. Nevus anemicus
Explanation: ### Explanation **Correct Answer: C. Tuberous Sclerosis (TSC)** The clinical triad of **hypopigmented macules (Ash-leaf spots)**, **infantile spasms** (West Syndrome), and **delayed milestones** is classic for Tuberous Sclerosis Complex. * **Pathophysiology:** TSC is an autosomal dominant neurocutaneous syndrome caused by mutations in the *TSC1* (Hamartin) or *TSC2* (Tuberin) genes, leading to the overactivation of the mTOR pathway and the formation of hamartomas in multiple organs. * **Dermatological markers:** Ash-leaf spots are often the earliest sign. Other features include Adenoma sebaceum (angiofibromas), Shagreen patches (connective tissue nevi), and periungual fibromas (Koenen tumors). * **Neurological markers:** Cortical tubers and subependymal nodules lead to seizures (infantile spasms) and intellectual disability. **Why Incorrect Options are Wrong:** * **A. Neurofibromatosis:** Characterized by *hyperpigmented* Café-au-lait macules, Lisch nodules, and neurofibromas, rather than hypopigmentation and infantile spasms. * **B. Sturge-Weber Syndrome:** Presents with a Port-wine stain (Nevus Flammeus) in the V1/V2 distribution of the trigeminal nerve, glaucoma, and leptomeningeal angiomas. * **C. Nevus Anemicus:** A localized vascular anomaly presenting as a pale patch due to catecholamine sensitivity. It does not cause systemic neurological symptoms or developmental delay. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign:** Ash-leaf spots (best seen under **Wood’s lamp**). * **Most common heart lesion:** Rhabdomyoma (often regresses spontaneously). * **Most common kidney lesion:** Angiomyolipoma. * **Drug of choice for Infantile Spasms in TSC:** Vigabatrin. * **Pathognomonic sign:** Koenen tumors (Periungual fibromas).
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