Figure 4: (a) On low power view (2) the indentation of the skin was also covered by stratified squamous epithelium with surface parakeratosis. The upper arrows point to the transition to normal orthokeratotic epidermis. The underlying dermis showed absence of adnexal structures. The edges of the indentation were marked by the presence of bundles of striated muscle fibers (lower arrow). The “*” sign marks the area shown in higher magnification in (b) (hematoxylin-eosin stain). (b) Striated muscle bundles at the edges of the skin indentation surround and entrap sweat gland ducts (10, hematoxylin-eosin stain).