title: Red weals under the sun.
mesh_terms: D002908:Chronic Disease; D003888:Desensitization, Immunologic / Q000379:methods; D006801:Humans; D010787:Photosensitivity Disorders / Q000209:etiology; D013472:Sunlight / Q000009:adverse effects*; D014581:Urticaria / Q000209:etiology* / Q000276:immunology