Reduced number of triple hairs and increased number of single hairs per follicular unit in the mid-frontal area compared to the occipital area.Hair shaft thickness diversity (anisotrichosis): a diversity ≥20% is diagnostic of androgenetic alopecia.Trichoscopic featuresĪssessment of the scalp should be undertaken in the midline of the frontal area at a point 2cm from the frontal hair and compared with the occipital area of scalp. It is characterised by diffuse thinning without frontal hairline recession. This condition is a multifactorial disorder in which different genes, increased dihydrotestosterone production in the skin, lack of intracutaneous synthesised estrogens, and abnormalities in prolactin-mediated signalling may contribute to the pathogenesis. Complete loss of hair can occur except at the lateral and posterior margins of the scalp. It is characterised by frontotemporal recessions and loss of hair over the vertex. This occurs when androgens induce miniaturisation through shortening of the anagen duration and prolongation of the telogen phase in genetically susceptible hair follicles. Male pattern hair loss (androgenetic alopecia) A progressive decline in the diameter, length, and pigmentation of the hair shaft with characteristic distribution is observed. ![]() Main causes of generalised noncicatricial alopecia:Īndrogenetic alopecia Introduction and clinical pictureĪndrogenetic alopecia is one of the most common causes of hair loss worldwide. Generalised noncicatricial hair loss is a non-scarring, potentially reversible type of hair loss.
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