Itchy Bumps on the Skin in Adults
There are several common causes for itchy, red bumps or patches on one or more skin areas. The causes discussed here are typically limited to just a few bumps or to small areas of the body. Some of these disorders, however, may also involve large body areas, but these are covered specifically under the Itchy Rash section.
The location of the bumps can sometimes provide a clue to their cause. Itchy bumps on the genitals may indicate lichen planus, molluscum, pubic lice, or scabies, while itchy scalp may be caused by head lice, folliculitis (inflammation of the hair follicle), psoriasis, or a form of eczema called lichen simplex. Bumps of acne will usually involve the face, neck, or trunk of the body, while certain forms of eczema (dyshidrotic eczema) and psoriasis will affect the hands or feet. Insect bites are usually only found in areas not covered by clothing or hair. In addition to the scalp, folliculitis can involve any area of hair that experiences injury, friction, or moisture (such as the buttock and inner thigh and areas that are typically shaved, such as the legs and beard area).
Non-contagious conditions that affect the genital region include psoriasis, intertrigo (breakdown and irritation of skin from moisture), allergic contact dermatitis, and irritant dermatitis, such as the condition diaper rash, which is common with infants.
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Acne excoriée, also known as "picker's acne," results when acne lesions are compulsively squeezed and scratched, resulting in scabs and scars. It is seen most commonly in adolescent girls and has been…
Bug Bite or Sting
Bites or stings from insects (arthropods) are very common. Most reactions are mild and result due to an allergic reaction to either the insect or the toxins injected with the bite or sting.
Dyshidrotic Eczema (Dyshidrotic Dermatitis)
Dyshidrotic eczema (dyshidrotic dermatitis) is generally defined as a rash limited to the hands (usually the palms and sides of the fingers) and sometimes the feet. Dyshidrotic eczema manifests as small, itchy…
Nipple dermatitis describes either itchiness or soreness of either one or both nipples. There are several possible causes of this problem, including eczema (atopic dermatitis), thrush (a yeast infection), an…
Folliculitis is a skin condition caused by an inflammation of one or more hair follicles in a limited area. It typically occurs in areas of irritation, such as sites of shaving, skin friction, or rubbing from…
Seborrheic keratoses are common benign growths of unknown cause seen in adults due to a thickening of an area of the top skin layer.
Molluscum is a common painless and usually harmless viral infection of the skin. Although it is painless and usually goes away after several months, some cases can last a few years.
Lichen Simplex Chronicus
Lichen simplex chronicus (LSC), also known as neurodermatitis circumscripta, is an itchy skin condition causing thickened skin at the areas of skin injured by repeated scratching and rubbing. Lichen simplex…
Pubic Lice (Pediculosis Pubis)
Pubic lice (pediculosis pubis), also known as crab lice or crabs, is a louse (a type of wingless, bloodsucking insect) that can live and multiply (infest) on skin that grows pubic hair. Pubic lice most commonly…
Scabies is an infestation of the skin caused by a tiny mite called Sarcoptes scabiei
. Scabies is very contagious and spreads rapidly in crowded areas such as hospitals, nursing…
Lichen planus (LP) is a disease of the skin and, less often, the scalp, fingernails, toenails, and/or inside the mouth or genitalia (mucous membranes). Lichen planus can resolve on its own without treatment or be…