Managing allergic contact dermatitis caused by sunscreen

1. An overview of sunscreen-induced dermatitis

Sunscreen allergy can occur in response to any ingredient in a sunscreen product, particularly in people with sensitive skin. The two main types of sunscreen are chemical and physical sunscreens. Ingredients that may cause allergic reactions include oxybenzone (benzophenone-3), cinnamates, and dibenzoylmethanes.

Some people may also develop allergies or sensitivities to fragrances and additives in sunscreen products. In certain cases, sunscreen allergy may develop or worsen following exposure to sunlight. The most commonly affected areas include the face, arms, backs of the hands, the V-shaped area of the upper chest, and the lower neck. In contrast, the upper eyelids, area beneath the chin, and skin behind the ears are less frequently affected.

Sunscreen-induced dermatitis can be classified into three types:

• Irritant contact dermatitis: Occurs when sunscreen contains ingredients that irritate the skin, particularly at high concentrations.
• Allergic contact dermatitis: Commonly affects people with sensitive skin who are prone to allergies. It occurs when the skin reacts to certain chemicals in sunscreen.
• Photoallergic contact dermatitis: Occurs when sunscreen is applied to the skin and the skin is subsequently exposed to UV radiation from sunlight. This reaction is associated with a mechanism similar to sunburn.

2. How to manage sunscreen-induced dermatitis

If you develop an allergic reaction to sunscreen, the best approach is to avoid all products containing the ingredients that trigger the reaction. Sunscreen allergies typically occur shortly after application, although reactions may occasionally develop later.

Signs of sunscreen allergy include skin redness, blistering, itching, burning, rashes, and vesicles. People with pre-existing eczema or psoriasis may be at greater risk of allergic reactions to sunscreen.

Before using a new sunscreen for the first time, apply a small amount to the skin on your wrist or another sensitive area to test for a reaction. Choose a broad-spectrum, mineral-based sunscreen with a sun protection factor (SPF) of 30 or higher.

Use caution with spray sunscreens, which can be difficult to control and may be inhaled, particularly when applying them to young children and infants. After applying sunscreen, wear long trousers, a long-sleeved shirt, and a wide-brimmed hat when going outdoors in the sun.

Treatment is similar to that for other allergic skin reactions. For mild reactions, wash the skin thoroughly with cool water to remove the sunscreen and avoid sun exposure until the skin has fully recovered. Apply moisturizer to the affected area to maintain skin hydration and relieve discomfort and burning.

For more severe reactions, treatment may include cold compresses to reduce pain and inflammation, moisturizers, antihistamines to relieve itching, or corticosteroids to reduce inflammation.

If you frequently experience sunscreen allergies, consider switching to a physical sunscreen containing mineral ingredients such as titanium dioxide and zinc oxide. A dermatologist can provide more specific recommendations for people who are particularly sensitive to sunscreen products.

The information above is for reference purposes only and is not intended as medical advice. Please contact your doctor for detailed medical consultation.