A rash that develops under the breast, or on the chest, may result from skin irritation or an allergic reaction. Other causes can include infections and skin conditions, such as eczema and psoriasis.

In this article, we describe some of the causes of a rash under the breast and the options for treatment. We also cover when to see a doctor.

transient acantholytic dermatosis which is a papulovesicular dermatosis or papular eczema image credit tvbanfield 2009Share on Pinterest
Image credit: Tvbanfield, 2009

Eczema, or atopic dermatitis, is a long-term autoimmune condition that typically affects children but can also occur in adults.

Eczema causes patches of skin to become:

  • itchy
  • red
  • dry, cracked, or scaly
  • sore

The rash can develop on any part of the body, but it usually affects the hands, elbows, knees, and face.

It can also occur in folds of skin, such as under the breasts or where the legs meet the buttocks. Symptoms tend to come and go, and the severity varies from person to person.

Doctors do not fully understand what causes eczema, but certain things seem to trigger symptoms in some people. Common triggers include:

  • soaps
  • detergents
  • particular foods
  • stress
  • weather

Treatments for eczema include moisturizing creams, or emollients, as well as topical steroids and antihistamines. It helps to avoid contact with known triggers.

Learn more about eczema here.

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Image credit: Digitalgadget, 2007