A peristomal plaque of sudden occurrence.
Michelangelo La PlacaDiego AbbenanteMassimiliano PazzagliaAmbra Di AltobrandoPublished in: Clinical case reports (2021)
Koebner phenomenon regards the formation of a psoriatic lesion after a trauma, including tattoo, insect bite or other injuries. Although this manifestation is not specific for psoriasis, physicians should be aware because early recognition may be helpful in making the diagnosis when present.