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Correspondence |

Renbök Phenomenon in a Patient With Alopecia Areata Universalis

Gloria M. Garnacho-Saucedo, Ph; Rafael Salido-Vallejo, Ph; M. Ángeles Álvarez-López, Ph; Enrique Casas de la Asunción, Ph; Juan Ruano-Ruiz, Ph, MD; Antonio Vélez García-Nieto, Ph, MD; Rafael Jiménez-Puya, Ph; José Carlos Moreno-Giménez, Ph, MD
Arch Dermatol. 2012;148(8):964-965. doi:10.1001/archdermatol.2012.470.
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The Renbök phenomenon, or reverse Koebner phenomenon, was first reported in 1991 by Happle et al,1 who described 4 patients with extensive alopecia areata of the scalp with hair growth within plaques of psoriasis. Three additional cases have subsequently been reported,24 and the term was later extended to include patients with mosaic phenomena, one with alopecia areata without a nevus flammeus, and another without a congenital nevus.5,6 Whereas the Koebner phenomenon involves psoriasis of traumatic or inflammatory origin, the Renbök phenomenon occurs when some inflammatory process is inhibited by psoriasis.

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Figure. Alopecia areata involving patient's entire scalp. Well-defined, scaly, red, retroauricular psoriatic plaques with terminal hair growth are seen, representing the only areas on his body with normal hair growth.




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