1.Bacterial diseases
Appearance boils, carbuncles, cellulitis, sweat glands, skin tuberculosis, earned sores, cutaneous anthrax, rhinophyma, cutaneous diphtheria, necrotizing acne, lower barren type pyoderma, leprosy, tropical ulcer mycobacterial ulcer, swimming pool granuloma, oral tuberculosis ulcer.
2.Fungal diseases
Cryptococcosis, histoplasmosis, coccidioidomycosis, Aspergillosis, pediculosis, nocardia, ringworm, pustular ringworm, cutaneous trichomycosis.
3.Viral diseases
Hand, foot and mouth disease, foot and mouth disease.
4.Parasitic diseases
Skin amoebiasis, skin fly maggot disease.
5.Sexually transmitted diseases
Genital sores, syphilis, inguinal granuloma, venereal lymphogranulomatosis.
6.Allergic skin diseases
Fixed drug rash.
7.Vasculitis and vascular diseases
Nodular polyarteritis, allergic vasculitis, thrombo-occlusive vasculitis, papulonecrotic tuberculosis rash, sclerosing erythema, gangrenous pyoderma, lethal midline granuloma wegener granuloma, occlusive arteriosclerosis, stasis dermatitis, Raynaud’s disease.
8.Physical diseases
Ray dermatitis Frostbite Decubitus ulcer.
9.Occupational skin diseases
Chromium-nickel, sodium, zinc, cobalt, hydrochloric acid sulfuric acid, hydrofluoric acid, sodium hydroxide, sodium carbonate can cause skin ulcers.
10.Autoimmune disease
Leukodystrophy.
11.Tumor
Eczema-like carcinoma, basal cell carcinoma, squamous carcinoma, malignant melanoma, sebaceous gland carcinoma, chapter-like granuloma, malignant histiocytosis on kaposi’s sarcoma, hair sheath carcinoma fibrosarcoma, proliferative erythema, verrucous carcinoma, multiple plasma cell tumors.
12.Other
Continuous limb dermatitis, nodular fat necrosis, fatty granuloma, penetrating foot ulcer, aphthous stomatitis, noma glans, acute female genital ulcer.