How is photosensitivity treated?
Dec 10, 2021
Source: Cainiu Health
Dr. Liu Wan
Introduction
Sun exposure should be minimized to protect the skin from ultraviolet (UV) radiation damage. Individuals with poor sunlight tolerance may gradually increase their sun exposure. Generally, it is advisable to avoid going outdoors during peak sunlight hours—between 10 a.m. and 2 p.m. When outdoors, use UV-protective measures such as umbrellas, wide-brimmed hats, and sunglasses. Sunscreen should also be applied to skin covered by clothing, as UV rays can penetrate fabric.
Photosensitivity refers to the development of red maculopapular or bullous rashes on sun-exposed skin areas—such as after sunlight or intense sun exposure—accompanied by sensations of burning, itching, and pain. The severity of the skin lesions correlates directly with the intensity, proximity, and duration of ultraviolet (UV) light exposure. Photosensitivity occurs in approximately half or more of patients with systemic lupus erythematosus (SLE); however, it lacks diagnostic specificity for SLE. Next, we address the question of how to treat photosensitivity.
How is Photosensitivity Treated?
Patients should rigorously avoid sun exposure to protect the skin from UV damage. Individuals with poor tolerance to sunlight may gradually increase their sun exposure over time. Generally, outdoor activities should be avoided between 10 a.m. and 2 p.m., when UV radiation is strongest. When outdoors, use broad-spectrum UV-protective measures such as umbrellas, wide-brimmed hats, and UV-blocking sunglasses. Apply broad-spectrum sunscreen at least 30 minutes before going outside. For prolonged outdoor activity, apply sunscreen even to skin covered by clothing, since UV rays can penetrate fabrics—especially swimwear and cotton T-shirts.
Sweating may remove applied sunscreen, necessitating frequent reapplication. However, sunscreens with excessively high SPF values or those containing ethanol may irritate the skin and trigger allergic reactions; therefore, they should be avoided whenever possible. Sunscreen alone is insufficient for adequate protection. When taking photosensitizing medications (e.g., certain antibiotics), minimize outdoor time and employ multiple layers of photoprotection. During active flare-ups, local cold compresses, antihistamines, corticosteroids, or hydroxychloroquine may be used—but these treatments should only be administered under medical supervision.
Knowledge Extension: What Is Photosensitive Dermatitis?
During summer months, intense UV radiation increases the risk of sunburn, manifesting as skin erythema, edema, desquamation, and pain. Additionally, improper use of facial cosmetics—or concurrent intake of photosensitizing drugs (e.g., quinolone antibiotics), consumption of certain wild vegetables, or ingestion of freshwater snails—may readily induce photosensitive dermatitis. These agents are known photosensitizers that heighten cutaneous sensitivity to sunlight.
Photosensitive dermatitis clinically presents with papules, vesicles, and erythematous plaques on both exposed and non-exposed skin areas, accompanied by pruritus. Medically, this condition is termed “vegetable-snail photosensitive dermatitis.”
The above outlines the management strategies for photosensitivity. We hope this information proves helpful to you.
