Sun allergy on the hands: what to know

The backs of the hands receive sunlight during ordinary activities such as driving or walking, while the palms are usually less exposed. A light-triggered rash may cause itching, small raised spots, dryness, or tiny blisters. Irritant hand dermatitis, allergic contact dermatitis, infection, and reactions to medicines can cause similar changes. Soap, sanitiser, gloves, and cleaning products may also aggravate the skin barrier. The timing matters: note whether symptoms start after outdoor exposure, follow a new product, or continue on days when the hands are covered.

Use gloves or clothing that cover the backs of the hands during prolonged exposure, and apply a suitable sunscreen to uncovered skin. Moisturise after washing with a bland, fragrance-free product if it does not sting. Avoid scratching, harsh scrubs, and new fragranced creams during a flare. Keep photographs and bring a list of medicines, hand products, and work exposures to an appointment. A clinician may prescribe a topical corticosteroid for active inflammation. If episodes are recurrent, narrowband UVB phototherapy may be discussed under supervision rather than attempted at home.

Arrange a review if the rash returns, cracks, oozes, becomes painful, affects movement, or does not settle after reducing exposure. Seek prompt care for rapidly spreading swelling, extensive blistering, pus, fever, severe pain, or swelling of the face or mouth. A clinician should check persistent changes because hand rashes often have more than one possible trigger.

Ask whether the distribution fits a light reaction, whether hand products or medicines may be responsible, and whether testing is needed for contact allergy. Clarify which protective gloves, moisturiser, or prescribed treatment can be used safely and when to return if the rash worsens.