Sun rash on hands: what to know

A rash limited to sun-exposed backs of the hands may follow ultraviolet irritation or a photosensitive reaction. The palms are less typical for a sun-triggered eruption because they receive less direct light. Heat, sweat, a new product, plant sap, or medication can also contribute. Contact dermatitis can affect the hands where soap, fragrance, gloves, or cleaning products touch the skin. Atopic dermatitis and psoriasis may flare after irritation, while ringworm or scabies can mimic an itchy rash without being caused by sunlight.

Notice whether the rash appears on both hands, spares covered skin, burns or itches, and develops after a new medicine or product. These details help a clinician separate a light reaction from [Contact Dermatitis](/conditions/contact-dermatitis/) or [Drug Rash](/conditions/drug-eruption/).

Move out of direct sun, cool the hands with a clean damp cloth, and wash gently with lukewarm water. Apply a plain fragrance-free moisturiser while the skin is slightly damp. Avoid scratching, harsh scrubs, essential oils, and fragranced creams. Cover the hands with lightweight fabric and use broad-spectrum sunscreen on intact skin when outdoors; reapply as directed on the product label. Do not put sunscreen on open blisters or weeping areas.

Arrange medical advice if the rash is spreading, keeps returning after sunlight, forms blisters, becomes painful, or does not settle after avoiding the suspected trigger. Seek urgent help for facial swelling, breathing trouble, faintness, extensive blistering, fever, or rapidly worsening skin. A clinician may review medicines and examine the rash; do not stop a prescribed medicine without advice.

Could this be a light-sensitive reaction, contact dermatitis, or another condition? Which medicines or products should I review? What should I use on the hands while the skin heals?