Definition: Dermatatrophia, also known as dermatitis vulgaris or psoriasis, is a chronic inflammatory skin condition that affects millions of people worldwide. It usually starts in childhood and can affect any part of the body, including the face, hands, and feet. The rash typically appears on the skin, causing itching and burning sensations. Psoriasis can be caused by an autoimmune response to certain substances or factors, such as pollution, stress, or exposure to sunlight. Psoriasis is a chronic condition