Acne in Special Populations — MCQs
Which of the following are treatment options for acne vulgaris?
A 17 year old girl had been taking a drug for the treatment of acne for the last 2 years, which has led to pigmentation. Which drug could it be?
Which is a specific lesion of acne vulgaris?
What is the key distinguishing feature between acne rosacea and acne vulgaris?
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 24-year-old male presents with a lesion at the site shown in the image for 4 years. He says it has increased in thickness over the years. Diagnosis is:
A 25-year-old female presents with the following lesions in the axilla, as shown by the arrow:
A young boy with oily skin presents with acne as shown. What is the appropriate treatment?
A male patient presents with patchy loss of hair involving the scalp, eyebrows, and beard with presence of grey hair in the affected areas. What is the most likely diagnosis?
What is the latest retinoid drug used in acne?
Acne in Special Populations Indian Medical PG Practice Questions and MCQs
Question 1: 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 2: A 17 year old girl had been taking a drug for the treatment of acne for the last 2 years, which has led to pigmentation. Which drug could it be?
- A. Doxycycline
- B. Minocycline (Correct Answer)
- C. Clindamycin
- D. Azithromycin
Explanation: ***Minocycline*** - **Minocycline** is a **tetracycline** antibiotic commonly used for acne and is notorious for causing various forms of **pigmentation**, including blue-gray discoloration of the skin, scars, and teeth, especially with long-term use. - This pigmentation is due to the formation of **insoluble chelates** of minocycline with iron and melanin within tissues. *Doxycycline* - While also a **tetracycline**, **doxycycline** is less commonly associated with significant **skin pigmentation** compared to minocycline at standard acne treatment doses. - Its side effect profile for pigmentation usually involves **photosensitivity** or **tooth discoloration** in children, not generally diffuse skin discoloration in adolescents. *Clindamycin* - **Clindamycin** is a **lincosamide antibiotic** primarily used topically or orally for acne, but it does not cause **pigmentation** as a known side effect. - Its main systemic side effect concern is **Clostridioides difficile-associated diarrhea (CDAD)**. *Azithromycin* - **Azithromycin** is a **macrolide antibiotic** and is not typically associated with **skin pigmentation** as a side effect. - It is sometimes used for acne, but its side effects are primarily **gastrointestinal** (nausea, vomiting, diarrhea).
Question 3: Which is a specific lesion of acne vulgaris?
- A. Wheals
- B. Papules
- C. Comedones (Correct Answer)
- D. Pustules
Explanation: ***Comedones*** - **Comedones are the pathognomonic (specific) lesion of acne vulgaris** and represent the primary lesion from which all other acne lesions develop - They result from follicular obstruction by sebum and keratin, forming **blackheads (open comedones)** and **whiteheads (closed comedones)** - Formed due to retention of follicular keratinocytes and increased sebum production, leading to characteristic **clogged pores** - Without comedones, a diagnosis of acne vulgaris cannot be made *Papules* - While papules are a common finding in acne vulgaris, they are **secondary inflammatory lesions** that arise from rupture and inflammation of comedones - They are small, solid, elevated lesions <1 cm in diameter representing an inflammatory response to follicular contents - Not specific to acne as papules occur in many other dermatological conditions *Pustules* - Pustules are also secondary inflammatory lesions in acne, representing **papules that have accumulated purulent material (pus)** - They appear as visible collections of pus surrounded by an inflammatory halo - Indicate a more advanced stage of the acne inflammatory process, but are not the defining lesion *Wheals* - **Wheals are NOT a feature of acne vulgaris** and are instead associated with **urticaria (hives)** or allergic reactions - They are transient, erythematous, edematous plaques resulting from histamine release leading to dermal edema - Completely unrelated to the pathophysiology of acne
Question 4: What is the key distinguishing feature between acne rosacea and acne vulgaris?
- A. Absence of comedones (Correct Answer)
- B. Erythema
- C. Papule
- D. Pustule
Explanation: ***Absence of comedones*** - A definitive distinguishing feature of **acne rosacea** is the **absence of comedones** (blackheads or whiteheads), which are a hallmark of acne vulgaris. - Rosacea often presents with papules, pustules, and erythema, but the lack of **follicular plugging** differentiates it. *Erythema* - **Erythema** (redness) is a common symptom in both acne rosacea and acne vulgaris, making it difficult to differentiate between the two. - In rosacea, erythema is often persistent and central facial, while in **acne vulgaris** it can surround inflamed lesions. *Papule* - **Papules** are elevated lesions seen in both acne rosacea and acne vulgaris, therefore, it cannot be used as a distinguishing feature. - In acne rosacea, papules are often associated with the background erythema, whereas in **acne vulgaris**, they typically arise from plugged follicles. *Pustule* - **Pustules** are observed in both acne rosacea and acne vulgaris, which means they are not a distinguishing factor. - In rosacea, pustules are usually small and superficial, while in **acne vulgaris**, they can be deeper and more numerous, often evolving from inflamed comedones.
Question 5: 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 6: A 24-year-old male presents with a lesion at the site shown in the image for 4 years. He says it has increased in thickness over the years. Diagnosis is:
- A. Spitz nevus
- B. Hyper-melanosis of Ito
- C. Becker's nevus (Correct Answer)
- D. Congenital melanocytic nevus
Explanation: ***Becker's nevus*** - This lesion typically presents as a **unilateral, hyperpigmented patch** that often appears during childhood or adolescence, increasing in size and thickness with associated **hypertrichosis** (increased hair growth). The image shows a large, irregularly shaped, hyperpigmented area on the torso of a young male, consistent with this description. - The history of increasing thickness over four years further supports **Becker's nevus**, as it is known to progress in thickness and texture, often becoming more indurated and sometimes verrucous. *Spitz nevus* - Spitz nevus is a benign melanocytic nevus typically presenting as a **pink or red, dome-shaped papule or nodule**, commonly on the face or limbs. - It rapidly grows but does not typically present as a large, hyperpigmented patch with associated hypertrichosis like the lesion shown. *Hyper-melanosis of Ito* - Hypermelanosis of Ito (also known as incontinentia pigmenti achromians) is characterized by **streaky or whorled hypopigmented (lighter) skin lesions**, often present at birth or in early infancy. - The image clearly shows a **hyperpigmented (darker) lesion**, which directly contradicts the characteristic hypopigmentation of hypermelanosis of Ito. *Congenital melanocytic nevus* - Congenital melanocytic nevi are typically present **at birth** or become apparent shortly thereafter. While they can be large and hyperpigmented, they usually do not have the prominent feature of increasing thickness and hypertrichosis developing many years later in adolescence or early adulthood in the same way as Becker's nevus. - The description of a lesion appearing during adolescence and increasing in thickness and hairiness for four years makes Becker's nevus a more specific diagnosis than a general congenital melanocytic nevus.
Question 7: A 25-year-old female presents with the following lesions in the axilla, as shown by the arrow:
- A. Hidradenitis Suppurativa (Correct Answer)
- B. Acne fulminans
- C. Acne conglobata
- D. Fox-Fordyce disease
Explanation: ***Hidradenitis Suppurativa*** - This image displays typical features of Hidradenitis Suppurativa, including **inflamed nodules**, **abscesses**, and **sinus tracts** in the intertriginous region (axilla in this case). - The disease commonly affects areas with **apocrine glands** and is characterized by chronic inflammation and scarring. *Fox-Fordyce disease* - This condition involves an **obstruction of apocrine sweat ducts**, leading to pruritic papules in apocrine gland-bearing areas. - While it affects similar anatomical locations as hidradenitis suppurativa, it does not typically present with the same degree of inflammation, deep nodules, abscesses, or sinus tracts. *Acne fulminans* - This is a rare and severe form of **acne vulgaris** characterized by the sudden onset of aggressive, ulcerative, and extensively inflamed nodules, cysts, and plaques with systemic symptoms like fever and arthralgia. - It primarily affects the **face, chest, and back**, not typically the axilla, and is associated with systemic inflammation. *Acne conglobata* - A severe form of **nodulocystic acne** characterized by interconnected abscesses, cysts, and sinus tracts, often leaving significant scarring. - While it involves extensive inflammation and sinus tracts, it primarily affects the **trunk and face**, not characteristically the axilla as the primary site of presentation in images like this.
Question 8: A young boy with oily skin presents with acne as shown. What is the appropriate treatment?
- A. Oral isotretinoin
- B. Oral steroid
- C. Topical retinoic acid (Correct Answer)
- D. Benzoyl peroxide
Explanation: ***Topical retinoic acid*** - The image shows **comedonal acne** with numerous small bumps, which typically responds well to topical retinoids like retinoic acid. - **Topical retinoids** work by normalizing follicular keratinization and reducing comedone formation, making them the **first-line treatment** for comedonal and mild to moderate inflammatory acne. - Retinoids are superior to other agents for comedonal acne due to their comedolytic properties. *Oral isotretinoin* - **Oral isotretinoin** is reserved for **severe cystic or nodular acne**, or acne that is unresponsive to other treatments, which does not appear to be the case here. - It has significant side effects and requires close monitoring, making it inappropriate for the initial treatment of mild to moderate acne. *Oral steroid* - **Oral steroids** are not a primary treatment for acne and are usually reserved for severe, **fulminant acne** (like acne conglobata) or to manage acute exacerbations of inflammatory acne due to their numerous side effects. - Their primary role is potent **anti-inflammatory action**, but they do not address the underlying pathogenesis of acne. *Benzoyl peroxide* - **Benzoyl peroxide** is effective against **inflammatory acne** due to its antibacterial and keratolytic properties. - While it can be used for comedonal acne and is often combined with retinoids for enhanced efficacy, **topical retinoids are preferred as monotherapy** for predominantly comedonal acne as shown in this image. - Benzoyl peroxide is particularly useful when there are inflammatory lesions (papules, pustules) present.
Question 9: A male patient presents with patchy loss of hair involving the scalp, eyebrows, and beard with presence of grey hair in the affected areas. What is the most likely diagnosis?
- A. Androgenic alopecia
- B. Anagen effluvium
- C. Alopecia areata (Correct Answer)
- D. Telogen effluvium
Explanation: ***Alopecia areata*** - This condition is characterized by **patchy hair loss** that can affect the scalp, eyebrows, and beard, and is often associated with the presence of **grey hairs** in the affected areas. - It is an **autoimmune disorder** where the immune system mistakenly attacks **hair follicles**, leading to non-scarring hair loss. *Androgenic alopecia* - This is commonly known as **male-pattern baldness** and typically presents as a receding hairline and thinning at the crown. - It is primarily driven by **genetics** and **androgen hormones**, and does not usually involve patchy loss or affect eyebrows and beard in the same way. *Anagen effluvium* - This condition is often caused by **chemotherapy** or other strong chemical exposures, leading to an abrupt and widespread loss of hair during the **anagen (growth) phase**. - Hair loss is typically diffuse and rapid, not usually localized to patches or accompanied by grey hair in specific areas. *Telogen effluvium* - This is a common form of **temporary hair loss** that occurs following a stressful event, fever, childbirth, or severe illness, causing premature shedding of hairs in the **telogen (resting) phase**. - It results in diffuse thinning rather than discrete patchy hair loss and is not typically associated with grey hair in the manner described.
Question 10: 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).
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