Skin allergy to tin usually appear rash, itching and other symptoms, serious cases may also appear some systemic symptoms. Tin is a metal, if allergic to tin, skin contact will appear after contact with the symptoms of contact dermatitis, mainly manifested as erythema, swelling, papules, blisters, and in some cases, also manifested as a wind ball or localized mucous membrane edema, most of which will be accompanied by itching symptoms. The extent of the specific lesions and contacts are generally consistent with a clearer border. If the symptoms are more serious, there may also be some systemic reactions, manifested as fever, chills, headache, nausea and so on. The severity of the specific condition is related to the nature, concentration, and mode of exposure of the exposure. If there is a clear history of exposure and the above symptoms appear after exposure, medical attention should be sought as soon as possible for definitive diagnosis and active treatment.