Alopecia areata totalis: complete hair loss except for a few individual hairs; with greater enlargement, the preserved (hairless) follicles can be seen
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.
Atrichia congenita diffusa. detail enlargement: forehead and parietal region of an 18-month-old boy in whom eyebrows, eyelashes and scalp hair have been missing since birth. hair, sebaceous gland and follicle structures are clearly visible.
Atheroma Chronic stationary, growing imperceptibly for more than 10 years, solitary, sharply defined, on the base well movable, indolent, plumply elastic, about 5.0 cm large, skin-colored, smooth lump.
Alopecia androgenetica in men; stage IV: horseshoe-shaped, complete clearing of the hair in the parietal region; remaining lateral and posterior crown of hair
Alopecia areata: Still relapsing-active alopecia areata: Marginal area, cadaverized hair and exclamation mark-like hair, as a sign of the still existing progression of the process.
Alopecia areata. roundish, centrifugally and medially spreading, smooth, hairless areas with preserved follicles. in the active marginal area hair can be pulled out in tufts. under internal steroid treatment with methylprednisolone for 4 weeks the hair loss stopped and re-growth in places occurred.
Sebaceous nevus: clinical aspect of a sebaceous nevus in a few-month-old infant; only the slight plaque-like elevation of the hairless area indicates the actual diagnosis.
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.
Alopecia postmenopausal, frontal, fibrosing: uniform receding of the frontal and temporal hairline. moderately pronounced ulerythema ophryogenes. keratosis follicularis on the extensor extremities.
Alopecia, post-menopausal, frontal, fibrosing: typical follicular inflammatory pattern (see frontal hairline). No symptoms. This results in a backward development of the forehead-hairline.
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