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Photodermatitis, sometimes referred to as sun poisoning or photoallergy, is a form of allergic contact dermatitis in which the allergen must be activated by light to sensitize the allergic response, and to cause a rash or other systemic effects on subsequent exposure.
Artificial UV light sources from tanning units and phototherapy treatment units can also trigger PLE. About three-quarters of patients acquire PLE after UV-A exposure only, one-tenth after UV-B exposure only, and the rest after a combination of UV-A and UV-B exposure. [6] People vary in the amount of sun exposure needed to trigger the rash. [15]
Other symptoms to note: Contact dermatitis appears following exposure to an irritant or allergen, and it’s the most common rash caused by external factors, Dr. Zeichner says. (This can include ...
Psoriasis rashes typically go through cyclical periods of flare-ups, which can last for weeks or months, the Mayo Clinic says. Other symptoms: In addition to the skin, psoriasis can sometimes also ...
Physical examinations look for signs of erythematous rashes and swelling of areas exposed to sun, including face, upper neck or back, and primary skin lesions which includes vesicle and blisters. [2] [4] For diagnostic uncertainty of photodermatoses, a medical professional may use other means to diagnose.
That can make it very hard in some cases for even the patient to realize that this is a sun-related condition,” Adler said. Other forms of photocontact dermatitis don't involve a burn or rash.