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