follicular disorders: Alopecia areata (Alopecia universalis) - Androgenic alopecia - Telogen effluvium - Lichen planopilaris - Trichorrhexis nodosa - Hypertrichosis (Hirsutism) - Acne vulgaris - Rosacea (Perioral dermatitis, Rhinophyma) - Epidermoid cyst - Sebaceous cyst - Pseudofolliculitis barbae - Hidradenitis suppurativa National Institutes of Health Building 50 at NIH Clinical Center - Building 10 The National Institutes of Health (NIH) is an agency of the United States Department of Health and Human Services and is the primary agency of the United States government responsible for biomedical research. ... Beyond overall skin structure, refer below to: See-also. ... The subcutis is the layer of tissue directly underlying the cutis. ... In zootomy, the integumentary system is the external covering of the body, comprised of the skin, hair, feathers, scales, nails, sweat glands and their products (sweat and mucus). ... Species S. aureus S. caprae S. epidermidis S. haemolyticus S. hominis S. lugdunensis S. pettenkoferi S. saprophyticus S. warneri S. xylosus Staphylococcus (in Greek staphyle means bunch of grapes and coccos means granule) is a genus of Gram-positive bacteria. ... Boil or furuncle is a skin disease caused by the inflammation of hair follicles, thus resulting in the localized accumulation of pus and dead tissues. ... For other uses, see Carbuncle (disambiguation). ... This article is about the nail disease. ... Species See text. ... Erythrasma is a skin disease that can result in pink patches, which can turn into brown scales. ... For the packaging type, see Blister pack. ... Pemphigus is an autoimmune disorder that causes blistering and raw sores on skin and mucous membranes. ... Bullous pemphigoid, also referred to as BP, is a chronic autoimmune skin disease, involving the formation of blisters below the surface of the skin and antibodies against collagen XVII. It can also (albeit only rarely) involve the mucous membranes, and has been shown to afflict dogs, cats, pigs, and horses... Dermatitis herpetiformis (DH) or Duhrings Disease, is a skin disorder often associated with celiac disease. ... For the beetle, see Exema. ... For the album by Ivor Cutler, see Dandruff (album). ... An infant with Cradle Cap Close up image of Cradle Cap Cradle Cap (Infantile seborrhoeic dermatitis, or crusta lactea, milk crust, honeycomb disease; croûte de lait, eczéma infantile, dermatite atopique infantile (French); ne shqip njihet si - rrjebull ose rrjebulla (Albanian); crosta lattea (Italian); and σμηγματόρροια του τριχωτού της κεφαλής των νεογνών (Greek)) is a patchy... Diaper rash (U.S.) or nappy rash (UK), is a generic term applied to skin rashes in the diaper area that are caused by a various skin disorders and/or irritants. ... Toxicodendron pubescens (Atlantic Poison-oak), one of a large number of species containing urushiol irritants. ... Contact dermatitis is a term for a skin reaction resulting from exposure to allergens or irritants. ... Erythroderma refers to a skin disorder characterized by the widespread reddening of the skin. ... Lichen simplex chronicus is a skin disorder characterized by chronic itching and scratching. ... Prurigo nodularis (PN) is a skin disease characterised by pruritic (itchy) nodules which usually appear on the arms or legs. ... An itch (Latin: pruritus) is an uncomfortable sensation felt on an area of skin that causes a person or animal to desire to scratch that area. ... Pruritus ani is a medical term which refers to persistent itching of the anus (and in Latin means literally the same thing). ... Nummular dermatitis is one of the many forms of dermatitis. ... Late stage of dyshidrosis on the hands Also known as Dyshidrotic Eczema Dyshidrotic Dermatitis Pompholyx Dyshidrosis is a skin condition that is characterized by small blisters on the hands or feet. ... Pityriasis alba is a common skin condition mostly occurring in children and usually seen as dry, fine scaled, pale patches on their faces. ... Psoriatic arthritis (or Arthropathic psoriasis) is a type of inflammatory arthritis that affects around 20% of people suffering from the chronic skin condition Psoriasis. ... Parapsoriasis refers to one of a group of skin disorders that are characterized primarily by their resemblance to psoriasis (red, scaly lesions), rather than by their underlying etiology. ... Pityriasis Lichenoides et Varioliformis Acuta, or Mucha Habermanns Disease, short form PLEVA, is a disease of the immune system. ... Pityriasis lichenoides chronica is the chronic version of the Pityriasis lichenoides et varioliformis acuta, also called Mucha Habermanns Disease. ... Pityriasis rosea is a skin disease marked by patches of pink, oval rash. ... Lichen planus is an inflammatory disease that affects the skin and the oral mucosa. ... Pityriasis Rubra Pilaris (PRP) is a chronic rare skin disorder characterized by reddish orange color of the skin, and scaling, flaky skin. ... Erythema is an abnormal redness of the skin caused by capillary congestion. ... Seen in about 5 percent of the population, Dermatographism is caused by Mast cells in the surface of the skin releasing histamines upon light scratching of the skins surface. ... Cholinergic urticaria is subcategory of physical urticaria (aka hives) that is a skin rash brought on by a hypersensitive reaction to body heat. ... Erythema is an abnormal redness of the skin caused by capillary congestion. ... Stevens-Johnson syndrome (SJS) is a severe and potentially life-threatening (15% of cases) disease, it is a hypersensitivity complex affecting the skin and the mucous membranes, a severe expression of erythema multiforme (EM) (and so SJS is also called erythema multiforme major). ... Stevens-Johnson syndrome (SJS) is a severe and life-threatening condition. ... Toxic epidermal necrolysis is a life-threatening and usually drug-induced dermatological condition that occurs more often in women than in men. ... Erythema nodosum is a form of inflammation of the subcutaneous fatty tissue. ... Erythema annulare centrifugum is a descriptive term for a skin lesion consisting of redness (=erythema) in a ring form (=annulare) that spreads from the center (= centrifugum). ... Erythema marginatum is described as the presence of pink rings on the trunk and inner surfaces of the arms and legs which come and go for as long as several months. ... Radiation as used in physics, is energy in the form of waves or moving subatomic particles. ... Actinic keratosis (also called solar keratosis, senile keratosis, or AK) is a premalignant condition of thick, scaly, or crusty patches of skin. ... Polymorphic Light Eruption (PLE) is a skin complaint caused by sunlight. ... Radiodermatitis is a skin disease associated with prolonged exposure to radiation. ... Erythema ab igne (EAI, or dermatitis ab igne) refers to skin that is reddened due to repeated exposure to heat radiation. ... Nail diseases are in a separate category from diseases of the skin. ... Onychocryptosis, commonly known as ingrown nails (unguis incarnatus) or ingrowing nails, is a common form of nail disease. ... Onychogryposis, also called rams-horn nail, is a thickening and increase in curvature of the nail. ... Beaus lines: Deep grooved lines that run from side to side on the fingernail. ... Yellow Nail Syndrome is the term that describes the triad of pleural effusions, lymphoedema and yellow dystrophic nails. ... Alopecia universalis is a medical disorder in which the afflicted are unable to grow hair on the entire body. ... Telogen Effluvium is characterized by sudden, diffuse hair loss caused by an interruption in the normal hair growth cycle. ... Lichen planus is an inflammatory disease that usually affects the skin, the mouth, or sometimes both. ... Trichorrhexis nodosa is a defect in the hair shaft characterized by thickening or weak points (nodes) that cause the hair to break off easily. ... Hypertrichosis is a medical term, also known as Wolfitis, referring to a condition of excessive body hair. ... Hirsutism (from Latin hirsutus = shaggy, hairy) is defined as excessive and increased hair growth in women in locations where the occurrence of terminal hair normally is minimal or absent. ... This article is about a skin disease commonly found during adolescence. ... Rosacea (IPA: ) is a common but often misunderstood condition that is estimated to affect over 45 million people worldwide. ... Perioral dermatitis Perioral dermatitis, a condition related to acne vulgaris, consists of red superficial pustules around the mouth and chin and the sides of the nose. ... Rhinophyma is a descriptive term for a large, bulbous, ruddy appearance of the nose caused by granulomatous infiltration. ... An epidermoid cyst is a benign cyst, developed out of ectodermal tissue. ... Close-up of an infected sebaceous cyst that has abscessed, located behind the ear lobe. ... Pseudofolliculitis barbae (pronounced //) is a medical term for persistent inflammation caused by shaving. ... Hidradenitis suppurativa or HS is a skin disease that affects areas bearing apocrine sweat glands and hair follicles; such as the underarms, groin and buttocks, and under the breasts in women. ...