What is a key distinguishing factor of psoriasis?

Psoriasis is primarily characterized by the presence of silvery scales that develop on red patches of skin. This distinctive feature is due to the rapid overproduction of skin cells, leading to a buildup that results in the formation of these scales. The red patches are inflamed areas where the skin is thickened and often itchy, but it is the silvery scales that are most emblematic of the condition.

Other conditions typically present with different features; for example, itchy red bumps may indicate allergic reactions or other inflammatory skin disorders, while yellow crusts and lesions are more often associated with infections or conditions such as impetigo. Dark brown spots can suggest hyperpigmentation or various skin disorders such as lentigines or melanoma, which are unrelated to psoriasis. Recognizing the silvery scales on red patches is crucial in diagnosing psoriasis and differentiating it from other skin conditions.