Skin lesion causes
| Cardiovascular | Subcutaneous nodules |
| Chemical/Poisoning | |
| Dental | No underlying causes |
| Dermatologic | No underlying causes |
| Drug Side Effect | Erythema multiforme, Erythema nodosum, Urticaria, Dermatitis, Photodermatoses, Steroids, ACTH, Phenobarbitone, Troxidone, Iodide, Bromide, Isoniazid, Chlornaphthalene, Chlorbenzole, Chlordiphenyl, Chlordiphenyloxide |
| Ear Nose Throat | No underlying causes |
| Endocrine | No underlying causes |
| Environmental | No underlying causes |
| Gastroenterologic | No underlying causes |
| Genetic | Ichthyosis, Genetic hypermelanosis, Hyperpigmentation syndrome, |
| Hematologic | No underlying causes |
| Iatrogenic | No underlying causes |
| Infectious Disease | No underlying causes |
| Musculoskeletal/Orthopedic | No underlying causes |
| Neurologic | No underlying causes |
| Nutritional/Metabolic | No underlying causes |
| Obstetric/Gynecologic | No underlying causes |
| Oncologic | No underlying causes |
| Ophthalmologic | No underlying causes |
| Overdose/Toxicity | No underlying causes |
| Psychiatric | No underlying causes |
| Pulmonary | No underlying causes |
| Renal/Electrolyte | No underlying causes |
| Rheumatology/Immunology/Allergy | No underlying causes |
| Sexual | No underlying causes |
| Trauma | No underlying causes |
| Urologic | No underlying causes |
| Miscellaneous | No underlying causes |
- Angiokeratoma
- Atypical fibroxanthoma*Basal cell carcinoma of the skin
- Dermatofibroma
- Dermatofibroma protuberans
- Dysplastic nevus
- Epithelioid (Spitz) tumors
- Halo nevus
- Histiocytoid hemangioma
- Keratoacanthoma
- Lentigo
- Lentigo maligna
- Metastasis of other primary tumors
- Mycosis fungoides
- Peripheral nerve sheath tumor
- Pigmented actinic keratosis
- Scar tissue or keloid
- Sclerosing angioma
- Sclerosing blue nevus
- Sarcoma
- Sebaceous carcinoma
- Seborrheic keratosis
- Spindle cell squamous cell carcinoma
- Squamous cell carcinoma of the skin
- Traumatic hematoma
- Melanocytic nevus and other benign melanocytic lesions
- Traumatized nevus
- Venous lake
- Vitiligo
Infectious Disorders (Specific Agent) Infestations/fleas/mites/lice American leishmaniasis/cutaneous Bartonellosis Black fly bites/infection Mycobacterium marinum/granuloma skin Pitted keratolysis syndrome/feet Skin infections/Pyoderma Syphilis, congenital Plague, bubonic Leprosy Pseudallesceriasis/mycosis Infected organ, Abscesses Pyoderma granuloma (vegetans) Granulomatous, Inflammatory Disorders Sarcoidosis Neoplastic Disorders Mycosis fungoides/T cell lymphoma Waldenstrom's macroglobulinemia Allergic, Collagen, Auto-Immune Disorders Epidermolysis bullosa acquisita Lupus erythematosis, systemic Behcet's Disease Metabolic, Storage Disorders Congenital erythropoetic porphyria Fabrys disease/Angiokeratatosis (trihexose ceramide) Ornithine Transcarbamylase (OTC) defic. Hereditary, Familial, Genetic Disorders Mediterranean fever, periodic Dyskeratosis, congenital/Zinsser Refsum's disease Vegetative, Autonomic, Endocrine Disorders Hidradenitis suppurativa