Which condition is characterized by excessive shedding of dead skin cells?

Prepare for the Dermatology PANCE with flashcards and multiple-choice questions. Each question includes hints and detailed explanations. Get exam-ready!

The condition characterized by excessive shedding of dead skin cells is psoriasis. Psoriasis is an autoimmune disorder that leads to rapid skin cell turnover, resulting in the buildup of thick, scaly plaques on the skin. Normally, skin cells regenerate about every 28-30 days, but in psoriasis, this process can occur in just a few days. As a result, the skin does not have enough time to shed the dead cells properly, leading to the formation of silvery scales that can be itchy and, at times, painful.

In contrast, options like pityriasis rosea, dermatitis, and eczema involve different mechanisms and symptoms. Pityriasis rosea is characterized by a herald patch followed by a pattern of smaller lesions and is self-limiting. Dermatitis, which can refer to various inflammatory skin conditions, does not typically involve the same excessive scaling seen in psoriasis. Eczema (often atopic dermatitis) also results in skin inflammation and potential dryness but is primarily associated with itchiness and less pronounced scaling compared to psoriasis. Hence, psoriasis is the most fitting choice when discussing excessive shedding of dead skin cells.

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