Multiple erythematous annular lesions with peripheral collorette of scales arranged predominantly on trunk are seen in –
**Core Concept**
Psoriasis is a chronic skin condition characterized by erythematous, scaly plaques, often arranged in annular or ring-like patterns. The lesions typically exhibit peripheral collarette of scales, which is a hallmark feature of this condition. The predominant involvement of the trunk is also a common clinical presentation in psoriasis.
**Why the Correct Answer is Right**
Psoriasis is a T-cell mediated autoimmune disease, where activated T-cells infiltrate the epidermis and induce keratinocyte proliferation, leading to the formation of scaly plaques. The peripheral collarette of scales is due to the accumulation of dead cells at the periphery of the plaque. The involvement of the trunk is due to the presence of high concentrations of keratinocytes, which are the target cells in this disease.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the characteristic peripheral collarette of scales, which is a key feature of psoriasis.
**Option B:** This option is incorrect because it does not mention the annular or ring-like pattern of lesions, which is typical of psoriasis.
**Option C:** This option is incorrect because it does not describe the predominant involvement of the trunk, which is a common clinical presentation in psoriasis.
**Clinical Pearl / High-Yield Fact**
Psoriasis often presents with a characteristic "inverse" distribution, with lesions predominantly involving the flexural areas (e.g., elbows, knees, scalp). This is due to the increased humidity and occlusion in these areas, which contributes to the development of psoriatic lesions.
**Correct Answer: D. Psoriasis.**