Histopathological examination showing regular elongation of rete ridges, hyperkeratosis, parakeratosis and neutrophil entrapment in the laminar keratin. Dilated vessels and papillae with cellular inflammatory infiltration are present in the dermis. (A) Hematoxylin and eosin staining, 100× magnification. (B) Hematoxylin and eosin staining, 40× magnification.
Teran et al. Journal of Medical Case Reports 2010 4:179 doi:10.1186/1752-1947-4-179