Physical urticaria is a distinct subgroup of urticaria (hives) that are induced by an exogenous physical stimulus rather than occurring spontaneously.[1] There are seven subcategories that are recognized as independent diseases.[2][3] Physical urticaria is known to be painful, itchy and physically unappealing; it can recur for months to years.[4]
^Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. pp. 265, 266, 267–268. ISBN978-1-4160-2999-1.
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^Beate, Henz (2000). "Antihistamines and Alternatives in Physical Urticaria". Dermatologic Therapy.
^Martina, Kozel; Mekkes, Jan; bossuyt, patrick (October 2001). "Natural course of physical and chronic urticaria and angioedema in 220 patients". Journal of the American Academy of Dermatology. 45 (3): 387–91. doi:10.1067/mjd.2001.116217. PMID11511835.