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Photodermatitis – Causes, Symptoms and Treatment

Photodermatitis is an inflammatory skin reaction triggered by UV radiation or visible light. Symptoms include redness, itching, and blistering on sun-exposed areas of the skin.

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Things worth knowing about "Photodermatitis"

Photodermatitis is an inflammatory skin reaction triggered by UV radiation or visible light. Symptoms include redness, itching, and blistering on sun-exposed areas of the skin.

What is Photodermatitis?

Photodermatitis is an umbrella term for inflammatory skin conditions triggered by ultraviolet (UV) radiation or visible light. The skin reacts with an excessive inflammatory response, which can manifest in various symptoms. There are two main categories: toxic (phototoxic) and allergic (photoallergic) forms.

Causes

Photodermatitis can be caused by a variety of factors:

UV radiation from natural sunlight or tanning beds
Phototoxic reactions: Certain medications, plants, or substances that increase the skin's sensitivity to light (e.g., tetracyclines, St. John's wort, bergamot)
Photoallergic reactions: The immune system reacts to a combination of light and certain substances such as sunscreens or fragrances
Polymorphous light eruption (PLE): The most common form, in which the skin reacts idiopathically after sun exposure
Genetic predisposition and conditions such as lupus erythematosus, which can increase light sensitivity

Symptoms

Symptoms of photodermatitis typically appear within minutes to hours after light exposure:

Redness and swelling of affected skin areas
Intense itching or burning sensation
Blisters or wheals (similar to urticaria/hives)
Scaling and crusting in chronic cases
Pigmentation changes after healing

Symptoms primarily affect light-exposed areas such as the face, neck, chest, and forearms.

Diagnosis

Diagnosis is typically made by a dermatologist using the following methods:

Medical history: Questions about medications, skincare products, and the timeline of symptoms
Phototesting: Controlled skin irradiation with defined UV doses to determine light sensitivity
Photopatch testing: Combination of patch testing and UV irradiation to diagnose photoallergic contact dermatitis
Blood tests: To rule out systemic conditions such as lupus erythematosus

Treatment

Acute Treatment

In the acute phase, the focus is on reducing inflammation and controlling symptoms:

Corticosteroids (topical or systemic) to reduce inflammation
Cooling and moisturizing skincare products
Antihistamines for intense itching
Avoiding further light exposure during the acute phase

Long-Term Management

For prevention and long-term control, the following measures are recommended:

Consistent UV protection using sunscreen (SPF 30 or higher), protective clothing, and avoiding intense sunlight
Discontinuing or replacing photosensitizing medications in consultation with a physician
Photohardening therapy: Controlled UV exposure to gradually acclimatize the skin
Photochemotherapy (PUVA) in severe cases

When to See a Doctor

Medical attention should be sought for intense, widespread, or recurrent skin reactions following light exposure. It is especially important to consult a doctor if fever, chills, or systemic symptoms occur, as these may indicate a more serious underlying condition.

References

Merk, H. F. et al. - Guidelines on Photodermatoses, German Dermatological Society (DDG), 2022
Lehmann, P. - Photodermatology: Photoallergic and phototoxic reactions. In: Braun-Falco's Dermatology, Springer, 2020
World Health Organization (WHO) - Ultraviolet radiation and skin cancer. WHO, Geneva, 2021. Available at: https://www.who.int/news-room/fact-sheets/detail/ultraviolet-radiation

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