Aplasia cutis congenita. a sharply defined, whitish-yellowish, shallowly sunken, hairless area with atrophic, parchment-like skin surface, existing since birth. on incident light microscopy any follicular structures are missing.
Aplasia cutis congenita. detail magnification: Classically specular, slightly sunken, light yellow macula with smooth surface. in the marginal area, in the lower left picture, a smaller area with tufted hairs is visible.
Aplasia cutis congenita. general view: 1.5 x 1.2 cm in size, hairless, slightly sunken, yellowish-whitish area with shiny surface, existing since birth, unchanged for years except for size increase during physical growth.
Acne conglobata: symmetrically distributed, eminently chronic, inflammatory and melting papules and pustules as well as strong, retracted scar formation, with retention fluctuating in places.
Aplasia cutis congenita. 8.0 x 6.0 cm, yellowish-white alopecic focus with shiny surface, existing since birth, unchanged for years except for size increase during physical growth.
Angiokeratoma of the glans penis. multiple, chronically stationary, 0.2-0.4 cm large, blue-red to brownish papules with partly smooth, partly scaly surface in the area of the corona glandis. these are congenital, circumscribed vascular ectasias.
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