Pseudopélade: Irregularly limited, hairless area. follicular structure is completely absent in the hairless area. thus a "scarred" final state of a previously expired inflammation leading to scarring is present. in congenital hairlessness the healing state of an "aplasia cutis congenita circumscripta" is present (see there).
Alopecia areata (Grade 2-3): extensive loss of hair in the capillitium. at higher magnification, the preserved (hairless) follicles can be seen. preserved hair rings partly mark the grown alopecia foci. note individual re-grown pigment-free hairs
alopecia postmenopausal, fibrosing, uniform receding of the frontal and temporal hairline. encircling a flat erythema originating from follicles. arrows: discrete perifollicular redness. distinct ulerythema ophryogenes with complete destruction of the eyebrows (square). keratosis follicularis on the extensor extremities.
Lupus erythematodes chronicus discoides. general view: For several years persistent, multiple, scarring, alopecic areas highlyoccipital, highly parietal and at the capillitium in a 57-year-old patient. Clear, extensive reddening of the skin of the head and face.
Naevus sebaceus: congenital, initially unnoticed, bumped, red hairless area; for several months formation of a painless, repeatedly bleeding node (arrow mark) Dg.: Naevus sebaceus with formation of a solid basal cell carcinoma.
alopecia areata. roundish, centrifugally and medially spreading, smooth, skin-coloured, hairless areas with preserved follicles. total foci from single foci formed by confluence. follicular structures clearly detectable.
Alopecia marginalis: Hair thinning and focal hairlessness due to constant, hairstyle-related pulling on the hair at the forehead hairline and parietally. 22-year-old woman who until recently wore tightly bound raster curls.
Keratosis pilaris syndrome. Inflammatory follicularly bound papules in the area of the hairline of a 41-year-old female patient, with multiple, whitish, atrophic areas in between with loss of the follicular ostia.
Postmenopausal fibrosing frontal alopecia: For several years now, the hairline has been continuously moving backwards. Clear ulerythema ophryogenes. Complete hairlessness of arms and legs (condition after keratosis pilaris) which has not been noticed before.
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