Skin reactions produced by heat, cold, light and actinic rays are commonly encountered. Many types of reactions are described, and many names are used to distinguish these types of reactions. We are familiar with such terms as erythema solare, dermatitis solare, erythema calorica, dermatitis calorica, dermatitis actinica and urticaria solare, which are used to designate the reaction produced by the before-named agents. There has been a tendency to consider these reactions as one and the same; but, on closer study, our attention has been called to the etiologic differences which have been forgotten but which should be kept in mind, since it is on the etiology that the true distinction is made.
From time to time articles have appeared in which attempts have been made to establish, as a clinical entity, the reaction produced by that special ray, whether it be heat, cold, light or actinic. We know now that
BEINHAUER LG. URTICARIA SOLARIS: REPORT OF A CASE. Arch Derm Syphilol. 1925;12(1):62–68. doi:10.1001/archderm.1925.02370070075007
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