Itchy skin on the chest may be due to dry skin, sweat spots, skin allergies and other factors. 1. Dry skin: some patients may have dry skin or use alkaline toiletries, which may cause dry skin, resulting in itching and flaking symptoms on the chest and skin areas. 2. Sweat patches: the cause of itching on the chest of the patient can not be ruled out due to Malassezia invasion of the skin stratum corneum, resulting in fungal skin infections, also known as florid chaff rash, which can cause itching symptoms on the chest skin. 3. Skin allergy: if the patient belongs to the allergic body, may be wearing chemical fiber clothing, local skin irritation, and then produce chest skin itching phenomenon. Itchy skin on the chest is likely to have other causes (such as ringworm), so if necessary, we need to cooperate with the doctor to improve the examination, to determine the cause and then do treatment and treatment.