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Temporal Triangular Alopecia Impact Factor | Open Access Journals
Journal of Cosmetology & Trichology

Journal of Cosmetology & Trichology

ISSN: 2471-9323

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Temporal Triangular Alopecia Impact Factor

Congenital triangular alopecia has been consistently described in the fronto-temporal region of scalp. There are reports of variable shapes of alopecia, which need not necessarily be triangular. It is usually unilateral (80%) and has been more commonly described on the left side and rarely described bilaterally. More than half the cases have been noticed between 2 and 9 years of age, while a little more than one-third of the cases have been noticed at birth. It is characterized by the presence of vellus hairs. It is a developmental defect that was once considered congenital but now many consider to be acquired. It is usually sporadic but rarely may occur in families and is considered to be a paradominant trait.
It may be misdiagnosed as alopecia areata, traction alopecia, trichotillomania, tinea capitis and aplasia cutis congenita. These can be easily differentiated using dermoscopy which would reveal normal follicular openings and vellus hairs in the patch of alopecia of congenital triangular alopecia. On histopathology, absence of mature hair follicles and presence of vellus hairs give an appearance of “miniaturized hair follicles” as seen in androgenetic alopecia Complete excision may be considered for small lesions, while others would require hair restoration surgery. Although some cases have been reported from India,we report this case to highlight the rare occurrence of large triangular patch of alopecia, involving the parietal, temporal and vertex regions of the scalp.

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