What are the symptoms of UV allergy?

Ultraviolet (UV) light allergy may manifest as skin erythema, pruritus, papulovesicles, burning or stinging sensations, and hyperpigmentation. Symptoms typically occur on sun-exposed areas such as the face, arms, and neck, and discomfort tends to worsen progressively after sun exposure. If systemic symptoms—such as dizziness or generalized malaise—or extensive skin erosion develop, prompt medical evaluation and treatment at a hospital are strongly recommended.

1. Skin Erythema:

Within a short time after exposure to intense light, well-demarcated, patchy red lesions appear on the skin, closely corresponding in distribution to the sun-exposed areas. Individuals with fairer skin tend to exhibit more pronounced reactions; erythema intensifies with prolonged UV exposure and does not resolve rapidly upon cessation of exposure.

2. Skin Pruritus:

Pruritus persists over the erythematous areas and is exacerbated by elevated temperature or physical contact with the affected skin. Repeated scratching damages the epidermis, increasing the risk of superficial skin breakdown and secondary local infection, thereby prolonging skin recovery.

3. Papulovesicles:

In more severe allergic reactions, dense small papules develop atop the erythematous patches; disease progression may lead to vesicle formation. These vesicles contain clear fluid and are prone to rupture and weeping upon friction; subsequent crusting delays skin repair.

4. Burning or Stinging Sensation:

Sun-exposed areas feel warm or hot; severe cases involve persistent stinging pain resembling a thermal burn. UV-induced damage compromises the skin barrier, reducing tolerance to external stimuli—thus even mild tactile contact can markedly amplify discomfort.

5. Hyperpigmentation:

Following resolution of acute allergic inflammation, residual hyperpigmented macules appear at the affected sites. Melanin deposition occurs at injured locations, and fading is slow. Subsequent UV exposure further darkens these pigmented marks, extending their duration.

When outdoors, prioritize physical sun protection—including umbrellas and long-sleeved clothing—and avoid peak-intensity sunlight (e.g., midday hours). After sun exposure, gently cleanse the skin with lukewarm water and apply moisturizing, soothing agents to help minimize the risk of allergic flare-ups.