People with polymorphic light eruption can react to UV radiation more severely than those who do not suffer this disease. UV radiation is simply a wavelength of sunlight invisible to the human eye. UV light has two wavelengths; UVA also called ultraviolet A and ultraviolet B or UVB. Patients with PMLE can react to both types of UV radiation. UVA can penetrate most Sunscreen, as well as glass, so patients with PMLE may still be affected by UVA indoors or while wearing sunscreen.
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