Is facial redness after sun exposure a sign of ultraviolet allergy?

Redness of the face after sun exposure may generally be due to ultraviolet (UV) allergy, or could result from physiological reactions or sunburn.

I. Non-disease Factors

1. Physiological Stimulation

If a person's skin is exposed to direct sunlight for prolonged periods, it can become irritated by the solar radiation. Facial redness following sun exposure is often a normal physiological response and typically does not require special treatment.

2. UV Allergy

Skin that is naturally thin or sensitive may develop small papules, pain, or itching when exposed to UV light. Additionally, subcutaneous capillaries may dilate under UV exposure, leading to redness and warmth after sun exposure. This condition can be managed with oral antihistamines such as loratadine tablets or cetirizine hydrochloride tablets.

3. Sunburn

Prolonged sun exposure may damage the skin, causing symptoms such as peeling or blistering. High-intensity heat over time can lead to thermal injury, resulting in redness. Topical treatments like mometasone furoate cream or hydrocortisone butyrate cream may be used to alleviate symptoms.

II. Disease-related Factors

Excessive exposure to UV radiation can trigger inflammatory skin reactions, manifesting as redness in exposed areas. To protect the skin, wearing hats or scarves to cover affected areas is recommended. In severe cases, topical medications such as erythromycin ointment or calamine lotion may be applied.

During recovery, maintain clean skin, avoid washing the face with hot water or alkaline cleansers, and refrain from applying warm compresses to the face.