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Solar Erythema – Causes, Symptoms and Treatment

Solar erythema is an inflammatory reddening of the skin caused by excessive UV radiation exposure. It is commonly known as sunburn and can involve pain, swelling, and blistering.

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Things worth knowing about "Solar Erythema"

Solar erythema is an inflammatory reddening of the skin caused by excessive UV radiation exposure. It is commonly known as sunburn and can involve pain, swelling, and blistering.

What is Solar Erythema?

Solar erythema is an acute inflammatory skin reaction caused by excessive exposure to ultraviolet (UV) radiation. It is clinically synonymous with sunburn. The skin responds to UV exposure with visible redness, warmth, swelling, and often significant pain. In severe cases, blistering may occur, and systemic symptoms such as fever, nausea, and chills can develop.

Causes

Solar erythema is caused by excessive UV radiation, particularly UV-B radiation (wavelength 290–320 nm), acting on unprotected skin. Key risk factors include:

Sun exposure without adequate sun protection
High altitudes or snow-covered environments (increased UV reflection)
Tropical regions or exposure during peak midday sun hours
Fair skin types (Fitzpatrick types I and II)
Photosensitizing medications (e.g., certain antibiotics, diuretics, or antidepressants)
Use of tanning beds

Symptoms

Symptoms of solar erythema typically appear 2–6 hours after UV exposure and peak at approximately 12–24 hours. The severity can be classified as follows:

Grade 1 – Mild Solar Erythema

Skin redness and warmth
Mild swelling
Tightness and skin sensitivity

Grade 2 – Severe Solar Erythema

Pronounced redness and swelling
Blistering (similar to a second-degree burn)
Intense pain
Systemic symptoms: fever, headache, nausea, chills, and fatigue

Diagnosis

Solar erythema is typically diagnosed clinically, based on the appearance of the skin and a history of UV exposure. Further diagnostic tests are generally not needed. If the reaction is atypical or a photodermatosis or phototoxic reaction is suspected, a dermatological evaluation may be warranted.

Treatment

Treatment depends on the severity of symptoms:

General Measures

Immediately move out of the sun and seek cool, shaded areas
Cool the skin with damp, cool cloths (avoid direct application of ice)
Drink plenty of fluids to prevent dehydration

Medical Treatment

Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac help reduce pain and inflammation
Topical treatments with moisturizing lotions or gels (e.g., aloe vera, panthenol) to soothe the skin
For severe blistering or secondary infection: medical care, potentially including corticosteroids or antibiotics

When to See a Doctor

Medical attention is recommended in cases of widespread blistering, high fever, altered consciousness, dehydration, or when infants and young children are affected.

Prevention

Solar erythema can be effectively prevented with appropriate protective measures:

Apply sunscreen with a high sun protection factor (SPF 30 or higher)
Wear protective clothing, hats, and sunglasses
Avoid intense midday sun (between 11 a.m. and 3 p.m.)
Reapply sunscreen regularly, especially after swimming
Gradually acclimatize the skin to sun exposure

Long-Term Consequences

Repeated episodes of solar erythema significantly increase the risk of skin cancer, including malignant melanoma, basal cell carcinoma, and squamous cell carcinoma. UV damage also accelerates premature skin aging (photoaging). Individuals with fair skin and those who experienced frequent sunburns in childhood are at particular risk.

References

World Health Organization (WHO): Ultraviolet radiation and the INTERSUN Programme. who.int/ultraviolet. Accessed 2024.
Lim HW et al.: Sunburn. In: UpToDate. Wolters Kluwer, 2023.
Narayanan DL, Saladi RN, Fox JL: Ultraviolet radiation and skin cancer. International Journal of Dermatology, 49(9):978–986, 2010.

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