A 36 year–old factory worker developed itchy, annular scaly plaques in both groins. Application of a corticosteroid ointment led to temporary relief but the plaques continued to extend at the periphery.The most likely diagnosis is –
**Core Concept**
The patient's symptoms of itchy, annular scaly plaques in the groin area suggest a skin condition that is characterized by inflammation and peripheral spread. This condition is typically responsive to topical corticosteroids initially, but the plaques continue to extend peripherally, indicating a chronic process.
**Why the Correct Answer is Right**
The patient's symptoms are consistent with **Seborrheic Dermatitis**. The condition is characterized by inflammation and peripheral spread of scaly plaques, particularly in areas rich in sebaceous glands, such as the groin and axillae. The initial response to topical corticosteroids suggests a superficial inflammatory process, but the continued peripheral spread indicates a more chronic process. Seborrheic dermatitis is often associated with an overgrowth of yeast in the skin, particularly **Malassezia** species.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Option D:** This option is not provided, however **Psoriasis** could be considered in the differential diagnosis, but it typically presents with well-defined, scaly plaques and does not respond as well to topical corticosteroids.
**Clinical Pearl / High-Yield Fact**
Seborrheic dermatitis is often associated with an overgrowth of yeast in the skin, particularly **Malassezia** species. This can be treated with antifungal agents, such as ketoconazole, in addition to topical corticosteroids.
**Correct Answer:** D.