Last Updated: 2019-08-26
Urticaria solaris, solar urticaria, photoallergic urticaria, solar urticaria
Urticaria, which can be triggered by UV rays (from infrared to UVC).
UV radiation (from short-wave IR to long-wave UVC radiation) is the trigger. Almost all patients react to visible light. A precursor of the allergen (chromophore) absorbs incident UV radiation and becomes the photoallergen. Specific IgE leads to the release of histamine and the development of urticaria.
Urticaria in UV-exposed areas. In rare cases Quincke's oedema and anaphylactic reaction may occur.
Photoprovocation testing (UVA, -B, -C, IR, visible light) with determination of minimal urticaria dose (MUD)
Serum factor test (not used for clinical routine)
Anaphylactic reactions are described for whole-body exposure.
Light hardening: The habituation effect usually lasts only a few days.
- PUVA therapy
Prednisolon approx. 0.5-1 mg / kg bw 1x daily, quickly levelling out.
Antihistamines e.g. Xyzal 5 mg 1x daily
Ciclosporin 3-5mg /kg bw short-term.