Bumps on skin

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] ; Associate Editor(s)-in-Chief: Raviteja Guddeti, M.B.B.S.[2]



Common Causes

Causes by Organ System

Cardiovascular No underlying causes
Chemical / poisoning No underlying causes
Dermatologic Cherry angioma, Acne Vulgaris, Actinic Keratosis, Allergic contact dermatitis, Atopic dermatitis , Acrospiroma, Basal Cell Carcinoma, Campbell de Morgan spots, Cleft upper lip, median -- cutaneous polyps, Eczema, Erythema elevatum diutinum, Erythema Nodosum, Febrile Ulceronecrotic Mucha-Habermann disease, Follicular hamartoma -- alopecia -- cystic fibrosis, Folliculitis, Ganglion, Granuloma Annulare, Hashimoto-Pritzker syndrome, Impetigo, Intradermal Cyst, Keratosis Pilaris, Moles, Papular mucinosis, Rosacea, Scleromyxedema, Sebaceous (Epidermoid) Cysts, Seborrheic Keratosis, Skin Tag, Sneddon-Wilkinson disease, Urticaria, Vascular malformation, Verruca, Common Warts, Wells syndrome, WHIM syndrome, Xanthomas, Tuberous sclerosis, Davenport-Donlan syndrome, Gianotti-Crosti Syndrome, Dermatomyositis, MSBD syndrome (Skin Cancer), FLOTCH syndrome
Drug Side Effect Etanercept , Methotrexate-associated lymphoproliferative disorders, Steroid abuse
Ear Nose Throat Davenport-Donlan syndrome
Endocrine Insulin-resistance syndrome type A, Sneddon-Wilkinson disease
Environmental Heat rash, Sun spots, Temperature-related eczema
Gastroenterologic Gastrointestinal Basidiobolomycosis, Primary biliary cirrhosis
Genetic Congenital hypotrichosis milia, Cowden's syndrome, Familial Eosinophilic Cellulitis, Guizar-Vasquez-Luengas syndrome, Hereditary hemorrhagic telangiectasis, Incontinentia Pigmenti, Jadassohn-Lewandowsky syndrome, Lewandowsky-Lutz dysplasia, Metachondromatosis, Multiple fibrofolliculoma familial, Puretic syndrome, Roch-Leri mesosomatous lipomatosis
Hematologic Anaplastic large cell lymphoma, Anaplastic small cell lymphoma, Body skin hyperlaxity due to vitamin K-dependent coagulation factor deficiency, Cutaneous mastocytosis, Eosinophilic pustular folliculitis, Mastocytosis - skin bumps, Multicentric reticulohistiocytosis, Primary cutaneous CD30-positive T-cell lymphoproliferative disorders, Primary Lymphatic Obstruction, Secondary Lymphatic Obstruction, T-cell lymphoma 1A, Aleukemic leukemia cutis, Lymphoma, WHIM syndrome
Iatrogenic No underlying causes
Infectious Disease


Abscess, Cutaneous Anthrax, Gianotti-Crosti Syndrome, Leprosy, MRSA, Mycobacterium abscessus, Mycobacterium haemophilum, Pyoderma gangrenosum, Pyogenic granuloma, Pinta, Scarlet Fever, Syphilis, Yaws


Condyloma, Genital herpes, HIV, Human Papillomavirus, Mansonella streptocerca infection, Molluscum Contagiosum, Orf




Cysticercosis, Demodicidosis, Paragonimiasis, River blindness, Sporotrichosis, Trichosporon, Scabies

Musculoskeletal / Ortho Dermatomyositis, Mixed sclerosing bone dystrophy, MSBD syndrome, Multicentric osteolysis -- nodulosis -- arthropathy, Nodulosis-arthropathy-osteolysis syndrome, Palindromic rheumatism, Neurofibromatosis-Noonan syndrome
Neurologic Neurofibromatosis, Neurofibromatosis-Noonan syndrome, Tuberous sclerosis
Nutritional / Metabolic Fucosidosis type II
Obstetric/Gynecologic No underlying causes
Oncologic Abdominal Cancer, Acrospiroma, Adult Fibrosarcoma, Aleukemic leukemia cutis, Basal Cell Carcinoma (Skin Cancer), Dermal melanoma, Dermatofibroma, Dermoid cyst, Desmoid tumor, Infantile Fibrosarcoma, Infantile myofibromatosis, Kaposi sarcoma, Keratoacanthoma, Lip cancer, Lymphoma, Malignant melanoma, Merkel cell cancer, Metastatic Carcinoma, Multiple keratoacanthoma, Ferguson-Smith type, Papilloma, Secondary skin tumor, Soft Tissue Sarcomas, Squamous Cell Carcinoma (Skin Cancer), Trichofolliculoma, Anaplastic large cell lymphoma, Anaplastic small cell lymphoma
Opthalmologic Cataract, alopecia, sclerodactyly
Overdose / Toxicity No underlying causes
Psychiatric No underlying causes
Pulmonary Wegener's granulomatosis
Renal / Electrolyte FLOTCH syndrome, Nephrogenic Fibrosing Dermopathy, Wegener's granulomatosis
Rheum / Immune / Allergy Autosensitization dermatitis, Bubble bath allergy, Cercarial dermatitis, Contact Dermatitis, Gout, Irritant contact eczema, Limited cutaneous systemic sclerosis, Pemphigus and fogo selvagem, Rheumatoid Arthritis, Seronegative arthritis, Soap allergy, Sunscreen allergy, Cataract, alopecia, sclerodactyly, Allergic contact dermatitis
Sexual No underlying causes
Trauma No underlying causes
Urologic No underlying causes
Dental No underlying causes
Miscellaneous Boil, Cavernous hemangioma, Cysts, Enlarged Lymph Nodes, Erucism, Hemangioma, Hyperplasia, Insect Sting Allergies, Keloid, Lepidopterism, Leprosy-like acne skin symptoms, Lipoid proteinosis of Urbach and Wiethe, Lipoma, Lubarsch-Pick syndrome, Lymphatic Obstruction, Lymphomatoid Granulomatosis, Neurofibroma, Polymorphic Light Eruption, Port wine stain, Pseudoxanthoma elasticum, Rash, Recurring Boil, Rombo syndrome, Spider nevi, Splinters or Other Foreign Bodies, Strawberry nevi, Stress-related eczema

Causes in Alphabetical Order