Itchy skin on the chest may be due to eczema, ringworm, contact dermatitis, breast paget’s disease and other factors. 1. Eczema: it is caused by a combination of internal and external factors, manifested as skin erythema, papules, blisters, oozing and other symptoms, mostly accompanied by itching, easy to recur. 2. ringworm: caused by fungal infection, manifested as small blisters, erythema, flaking and other symptoms, with the prolongation of time will be gradually connected and fused together in a ring, often accompanied by itching, fungal microscopy can be clearly diagnosed. 3. Contact dermatitis: contact with some irritating or allergic substances may lead to inflammatory reactions in the skin, usually the scope of dermatitis and contact with the general consistency of the material, manifested as erythema, edema, itching, burning and other symptoms. 4. Breast page’s disease: also known as eczema-like cancer, the cause of which is not yet clear, manifested as red patches, crusts, scales, vesicles, ulcers and other eczema-like changes, accompanied by itching, pain and other symptoms. Itchy skin on the chest may also be caused by other factors, it is recommended that patients seek timely medical attention and actively cooperate with the relevant examination in order to clarify the cause of the disease and carry out targeted treatment.