KOEBNER’S PHENOMENON PSORIASIS

 The “Koebner phenomenon” was named after Dr. Koebner who in the 19th century observed that a patient developed new psoriasis lesions in areas where his horse bit him. One may observe a new psoriasis flare within  10 to 14 days following an injury to the skin. A Koebner phenomenon has been observed in approximately half of all psoriasis patients, but may also occur with eczema, or dermatitis. In some cases shaving or even the adhesive from a band aid can result in Koebner’s phenomenon.