During the summer months, many people experience itchy, red rashes after sun exposure and automatically assume they have a sun allergy. However, the reality can be more complex. Symptoms may be caused not only by sunlight, but also by cosmetics, photosensitising medications, allergic reactions or even certain nutritional deficiencies.
True sun allergy, medically known as polymorphic light eruption (PLE), typically develops several hours or days after intense exposure to ultraviolet (UV) radiation. Small, itchy rashes usually appear on areas of skin exposed to the sun. By contrast, photoallergic reactions caused by sunscreens, fragranced cosmetics or perfumes occur when the substance comes into contact with UV light. Although the symptoms of these conditions can be similar, their underlying causes are different.
Diet can also play an important role in skin health. Hypersensitivity reactions to certain foods, as well as zinc deficiency, may impair the skin’s ability to regenerate and contribute to inflammatory processes. During the summer, increased UV exposure may make these issues more noticeable.
If rashes recur regularly, persist for several days, or their cause is unclear, laboratory testing may help investigate possible underlying factors. Total IgE testing can provide information about a possible allergic tendency, while food intolerance panels may help identify certain hypersensitivities. Zinc testing can also help detect deficiencies that may affect skin health. It is important to note that laboratory results should always be interpreted together with the symptoms and a medical examination. Book an appointment at our laboratory and find out more about the possible causes of your symptoms.
Frequently Asked Questions
Is every rash that appears after sun exposure a sun allergy?
No. Cosmetics, medications and other allergic or inflammatory reactions may also be responsible.
Can laboratory testing help identify the cause?
Yes. In certain cases, laboratory tests can provide information about allergic predisposition, hypersensitivity reactions or nutritional deficiencies.
Can zinc deficiency cause skin problems?
Yes. Zinc plays an important role in skin regeneration and the normal functioning of the immune system, so inadequate zinc levels may contribute to certain skin problems.