There are thousands of skin diseases, broadly divided into the following categories: 1, infectious skin diseases including: bacterial infections, viral infections, fungal infections, etc.; 2, immune skin diseases including: aspergillosis, aspergillosis, etc.; 3, allergic diseases including: eczema, allergic dermatitis, urticaria, etc.; 4, erythematous scaling diseases including: psoriasis, hair red furuncle, etc.; 5, metabolic skin diseases including: lid xanthoma, etc.; 6, skin tumors including: benign tumors, malignant tumors; 7, non-specific skin diseases including: granuloma annulare, gangrenous pyoderma, etc.