UV hardening is used in several photosensitive dermatoses, such as polymorphous light eruption (PMLE) and solar urticaria. รูปแบบต่างๆของ photohardening เช่น UVB, both broadband and narrowband; psoralen plus UVA therapy; and a combination of UVA/UVB radiation, have been administered. Treatment for these dermatoses is often provided in early spring for a limited period of time.