Skin disease refers to a disease related to the skin. After the skin (including hair and nails) is affected by internal and external factors, its morphology, structure and function all change, resulting in pathological processes, and correspondingly various clinical manifestations. The incidence of skin diseases is very high, with repeated attacks, mostly mild, often not affecting the patient's life, and many are difficult to cure. It is a disease that causes great physical and mental pain to patients and affects the quality of life. The most obvious is itching and changes in skin appearance. Common skin diseases include psoriasis, vitiligo, herpes, rosacea, impetigo, suppurative bacterial infection, scabies, scars, ringworm, ichthyosis, axillary odor, acne, folliculitis, alopecia areata, hair loss, baby diaper rash, corns, freckles, sweat herpes, mite dermatitis, eczema, urticaria, onychomycosis, scleroderma, skin itching, hair loss, chloasma, and sexually transmitted diseases include syphilis, condyloma acuminatum, gonorrhea, non-gonococcal urethritis, etc.