Skin redness or inflammation; Skin lesion; Rubor; Skin rash; Erythema

A simple rash is called dermatitis, meaning inflammation of the skin. Contact dermatitis is caused by things your skin touches, such as:

• Chemicals in elastic, latex, and rubber products
• Cosmetics, soaps, and detergents
• Dyes and other chemicals in clothing
• Poison ivy, oak, or sumac

Seborrheic dermatitis is a rash that appears in patches of redness and scaling around the eyebrows, eyelids, mouth, nose, the trunk, and behind the ears. If it happens on your scalp, it is called dandruff in adults and cradle cap in infants.

Age, stress, fatigue, weather extremes, oily skin, infrequent shampooing, and alcohol-based lotions aggravate this harmless but bothersome condition.

Other common causes of a rash include:

• Eczema (atopic dermatitis) -- tends to happen in people with allergies or asthma. The rash is generally red, itchy, and scaly.
• Psoriasis -- tends to occur as red, scaly, itchy patches over joints and along the scalp. Fingernails may be affected.
• Impetigo -- common in children, this infection is from bacteria that live in the top layers of the skin. Appears as red sores that turn into blisters, ooze, then crust over.
• Shingles -- a painful blistered skin condition caused by the same virus as chickenpox. The virus can lie dormant in your body for many years and re-emerge as shingles.
• Childhood illnesses such as chicken pox, measles, roseola, rubella, hand-foot-mouth disease, fifth disease, and scarlet fever.
• Medications and insect bites or stings.

Many medical conditions can cause a rash as well. For example:

• Lupus erythematosus
• Rheumatoid arthritis , especially the juvenile type
• Kawasaki disease

Images

Poison ivy on the knee

Erythema toxicum on the foot

Shingles

Psoriasis, guttate on the arms and chest

Erythema multiforme on the leg

Roseola

Systemic lupus erythematosus rash on the face

Acrodermatitis

Erythema annulare centrifugum - close-up

Psoriasis, guttate on the cheek

Cellulitis

Erythema multiforme, target lesions on the palm

Poison ivy on the leg

Poison oak rash on the arm

Erythema multiforme, circular lesions - hands

Next Section

Rashes Treatment

Review Date: 08/08/2009
Reviewed By: Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org)