If there is a piece of skin on the elbow that is rough like ringworm, it may be caused by localized dry eczema, or psoriasis and other diseases if there is severe flaking. It is recommended to go to the hospital in time to do a checkup to clarify the specific cause of the disease. 1. Dry eczema is related to the loss of water on the surface of the skin, the reduction of oil secretion, poor perspiration and other factors, and clinically often manifested as dry skin, cracking and flaking, itching and so on. 2. The occurrence of psoriasis is often related to the body’s immune factors, and the environment, heredity and infection are also important factors. Typical manifestations of psoriasis are scaly red spots or plaques with clear borders, often accompanied by flaking. There may be other reasons for the occurrence of the above situation, so it is recommended to go to the hospital in time to determine the cause of the disease to the cause of treatment, usually pay attention to develop good living habits, pay attention to skin moisturizing, more exercise, improve immunity.