1.Diseases of skin appendages: acne and acne pits, acne marks, rosacea mountain. 2, superficial proliferative skin diseases: seborrheic keratosis pilaris (age spots), black papulosis, flat warts, filiform warts, etc.; 3, facial pigmented skin diseases: freckles, nevus of Ota, pigmented nevus, cafe-au-lait spots, tattoos, chloasma, photodamaged spots / sun spots; freckles, solar freckle-like nevus, vitiligo, etc.; 4, facial dermatitis category: contact dermatitis, eczema, seborrheic dermatitis, hormone-dependent dermatitis, Seasonal contact dermatitis, facial reoccurring dermatitis and so on.