Overview
Contact dermatitis causes red, itchy, and inflamed skin at the site of exposure.
Contact dermatitis is a type of eczema triggered by external substances. It can be irritant (caused by chemicals) or allergic (caused by an immune reaction). It is a common skin condition that can affect people of all ages and typically occurs on areas of skin that have been in direct contact with the offending substance.
A dermatologist can help identify the trigger and recommend appropriate treatment.
While contact dermatitis is not contagious or life-threatening, it can be very uncomfortable and, in severe cases, may lead to secondary skin infections if left untreated. Identifying and avoiding the trigger is the most important step in managing the condition.
Key Facts
- Two main types: irritant contact dermatitis and allergic contact dermatitis.
- Irritant contact dermatitis is more common and is caused by direct skin damage.
- Allergic contact dermatitis is an immune reaction that develops after sensitization.
- Common triggers include soaps, detergents, solvents, nickel, poison ivy, and fragrances.
- Most cases improve with trigger avoidance and topical treatment.
Symptoms
Symptoms include red, itchy, dry, or scaly skin at the site of contact.
Symptoms include red, itchy, dry, or scaly skin. In allergic contact dermatitis, a rash may appear in a localized area. Blisters and oozing can occur in severe cases. Symptoms usually appear at the site of contact, but in allergic reactions, they may spread to other areas, especially if the allergen is transferred by touch.
Common Symptoms
- Redness and inflammation of the skin
- Intense itching
- Dry, scaly, or cracked skin
- Burning or stinging sensation
- Swelling and tenderness
- Blisters that may ooze or crust over
- Skin darkening or thickening in chronic cases
Irritant vs Allergic Symptoms
Irritant contact dermatitis tends to cause a burning, stinging sensation and may appear quickly after exposure. Allergic contact dermatitis is typically delayed (24–72 hours), intensely itchy, and may spread beyond the area of initial contact.
Causes
Common irritants include soaps, detergents, and cleaning products.
Irritant contact dermatitis is caused by substances like soaps, detergents, and solvents. Allergic contact dermatitis is caused by allergens like nickel, poison ivy, and fragrances. The reaction occurs when the skin comes into direct contact with these substances.
Common Irritants
- Soaps, body washes, and hand sanitizers
- Detergents and fabric softeners
- Cleaning products and disinfectants
- Solvents, acids, and alkalis
- Industrial chemicals and cement
- Repeated wet work (water exposure)
Common Allergens
- Nickel and other metals (jewelry, belts, buttons)
- Poison ivy, poison oak, and poison sumac (urushiol oil)
- Fragrances and perfumes
- Preservatives in cosmetics and creams
- Rubber (latex) gloves
- Hair dyes and textile dyes
- Certain topical medications
Risk Factors
- Occupational exposure (healthcare, cleaning, hairdressing, construction)
- Pre-existing skin conditions such as atopic dermatitis
- Working with water or chemicals regularly
- Age (infants and older adults may have more sensitive skin)
Treatment
Moisturizers and topical corticosteroids help soothe inflamed skin.
Treatment includes identifying and avoiding the trigger, using soothing emollients, and applying topical corticosteroids. Most cases resolve within a few weeks once the cause is removed and the skin is allowed to heal.
Self-Care and Home Treatment
- Wash the affected area gently with mild soap and lukewarm water to remove any residue.
- Apply a fragrance-free moisturizer or emollient to soothe and protect the skin.
- Avoid scratching to reduce the risk of infection.
- Use cool compresses to relieve itching and inflammation.
- Avoid known irritants and allergens.
Medical Treatment
- Topical corticosteroids: Reduce inflammation and itching.
- Oral antihistamines: Help control itching, especially at night.
- Oral corticosteroids: Used for severe or widespread reactions.
- Calcineurin inhibitors: Alternative anti-inflammatory creams for sensitive areas.
- Antibiotics: If a secondary bacterial infection develops.
Prevention
- Identify and avoid the trigger substance.
- Wear protective gloves or clothing when handling irritants.
- Use fragrance-free and hypoallergenic skin products.
- Keep the skin moisturized to maintain its barrier function.
- Patch test new products before regular use.
When to See a Doctor
Seek medical advice if the rash is severe, painful, or does not improve.
See a doctor if the rash is severe, painful, or doesn't improve with home care. You should also seek medical attention if the rash spreads rapidly, involves the face or genitals, or shows signs of infection.
Seek Prompt Medical Care If You Notice:
- Severe pain or discomfort
- Widespread rash or blistering
- Signs of infection: pus, increased warmth, swelling, fever
- Rash that does not improve after 2–3 weeks of home care
- Rash on the face, eyes, or genitals
- Difficulty breathing or swelling of the lips or throat (seek emergency care)
Diagnosis
A doctor will typically diagnose contact dermatitis through a physical examination and a detailed history of exposures. If allergic contact dermatitis is suspected, a patch test may be performed to identify the specific allergen.