Chloasma ni indwara ikunze kugaragara mu buvuzi. Ikunze kugaragara ku bagore bari mu kigero cyo kubyara, kandi ishobora no kugaragara ku bagabo batazwi cyane. Irangwa n'amabara ahwanye ku matama, ku gahanga no ku matama, ahanini mu ishusho y'amababa y'ibinyugunyugu. Umuhondo woroshye cyangwa umukara woroshye, umukara wijimye mwinshi cyangwa umukara woroshye.
Hafi ya buri bwoko bw’abantu bake bakomoka mu moko n’amoko ashobora kurwara iyi ndwara, ariko uturere dufite imirasire y’izuba ikabije, nka Amerika y’Epfo, Aziya na Afurika, dufite umubare munini w’abayirwara. Abenshi mu barwayi barwara iyi ndwara bari mu kigero cy’imyaka 30 na 40, kandi ku bantu bafite imyaka 40 na 50 ni 14% na 16%. Abantu bafite uruhu rw’umweru batangira kare, abantu bafite uruhu rw’umukara bakura nyuma, ndetse na nyuma yo gucura. Ubushakashatsi bwakozwe n’abaturage bato muri Amerika y’Epfo bwerekana ko hari hagati ya 4% na 10%, abagore batwite na 10% ku bagabo.
Dukurikije aho ikwirakwizwa, melasma ishobora kugabanywamo ubwoko butatu bw'indwara, harimo hagati mu maso (harimo agahanga, inyuma y'izuru, amatama, nibindi), zygomatic na mandible, kandi igipimo cy'indwara ni 65%, 20%, na 15%. Byongeye kandi, zimwe mu ndwara z'uruhu zidasanzwe, nka idiopathic periorbital skin pigmentation, zifatwa nk'izifitanye isano na melasma. Dukurikije aho melanin iherereye mu ruhu, melasma ishobora kugabanywamo ubwoko bwa epidermal, dermal n'ubwoko buvanze, muri bwo ubwoko bwa epidermal ni bwo bukunze kugaragara cyane, kandi ubwoko buvanze ni bwo bushoboka cyane.Itara rya WoodIfasha mu kumenya ubwoko bw'indwara. Muri zo, ubwoko bw'uruhu rw'umukara wijimye munsi y'urumuri rwa Wood; ubwoko bw'uruhu rw'umukara wijimye cyangwa ubururu bwijimye munsi y'ijisho, kandi itandukaniro ntirigaragara munsi y'urumuri rwa Wood. Gushyira melasma mu byiciro nyabyo ni ingirakamaro mu guhitamo uburyo bwo kuvura nyuma.
Igihe cyo kohereza: Gicurasi-06-2022
