Itchy skin and scratching the skin with yellow water may be related to eczema combined with infection, herpes-like pemphigus, folliculitis and other reasons. 1. Eczema combined with infection: often manifested in the skin erythema on the basis of pimples, papules, can be accompanied by obvious itching symptoms. If secondary bacterial and other pathogenic infections, there may be localized suppuration, the formation of pustules, pus crusts, etc., after scratching the skin, may be manifested as yellow water. 2. Herpes-like pemphigoid: it occurs in middle-aged and old people, the skin damage is polymorphic, there are erythema, papules, wind, etc., small blisters of small diameter can be seen, and after scratching, the phenomenon of yellow water can appear. 3. Folliculitis: red papules appear at the mouth of the hair follicle, higher than the skin surface, a few days later, pustules appear in the center of the rash, surrounded by redness and swelling. If the pustules rupture, yellow or white secretions can be seen. Itchy skin scratching yellow water may also be other diseases, such as impetigo. It is recommended that patients with the above symptoms go to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.