A 24 year old unmarried woman has multiple nodular, cystic, pustular and comadonic lesions on face, upper back and shoulders for 2 years. The drug of choice for her treatment would be –
**Core Concept**
The question is testing the student's knowledge of the pharmacological management of acne vulgaris, a common skin condition characterized by the presence of comedones, papules, pustules, and nodules. The underlying principle being tested is the use of isotretinoin, a retinoid, as a first-line treatment for severe acne.
**Why the Correct Answer is Right**
The correct answer is a retinoid, specifically isotretinoin, which is a derivative of vitamin A. Isotretinoin works by inhibiting the sebaceous gland's ability to produce sebum, reducing the growth of Propionibacterium acnes (P. acnes), and preventing the formation of comedones. It also has anti-inflammatory properties, which help to reduce the size and number of acne lesions. Isotretinoin is particularly effective in treating severe acne, including nodulocystic acne, which is characterized by large, painful nodules and cysts.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely a topical antibiotic, such as erythromycin or clindamycin, which may be used to treat mild to moderate acne. However, they are not the drug of choice for severe acne.
**Option B:** This option is likely a topical retinoid, such as adapalene or tretinoin, which may be used to treat mild to moderate acne. However, they are not as effective as oral isotretinoin for severe acne.
**Option C:** This option is likely a hormonal treatment, such as spironolactone, which may be used to treat acne in women with polycystic ovary syndrome (PCOS). However, it is not the first-line treatment for severe acne.
**Clinical Pearl / High-Yield Fact**
Isotretinoin is a highly effective treatment for severe acne, but it is associated with several potential side effects, including dry skin, lips, and mucous membranes; increased risk of sunburn; and teratogenicity. Therefore, it is essential to carefully monitor patients taking isotretinoin and to advise them to use effective contraception.
**Correct Answer:** C. Isotretinoin