How common are skin blisters in contact dermatitis?

Contact dermatitis develops where skin reacts to an irritating substance or to an allergen that has caused sensitisation. The area may become red, itchy, swollen, cracked, or blistered. Irritant reactions can follow repeated contact with soaps, cleaners, solvents, or moisture; allergic reactions can follow contact with substances such as fragrances, metals, or plants.

The shape and location may provide clues, such as a sharp edge where a product touched the skin, but blisters also occur in infections and other inflammatory conditions. Diagnosis depends on the exposure story and examination rather than the blister alone.

Rinse the exposed skin with lukewarm water, remove contaminated clothing or jewellery, and avoid the suspected product until a clinician has reviewed it. Use a bland moisturiser if it does not sting, and protect open areas with a clean non-stick dressing. Do not scratch or intentionally break blisters.

Keep a list of new cosmetics, gloves, adhesives, detergents, and workplace substances. If the rash keeps returning, patch testing may help identify an allergy and guide safer product choices.

Arrange an assessment when blistering is widespread, painful, recurrent, or interfering with sleep or work. Seek urgent help for facial swelling, trouble breathing, eye involvement, rapidly spreading redness, fever, pus, or increasing warmth and tenderness around broken skin.

Ask whether the pattern suggests irritant or allergic contact dermatitis, which products to stop, how to dress the blisters, and whether patch testing is appropriate. Bring photographs from the start of the reaction and a list of recent exposures.