Chloasma ni indwara ikunze kuboneka mu ruhu rwa pigmentation. Ahanini iboneka ku bagore bafite imyaka yo kubyara, kandi irashobora no kugaragara kubagabo batamenyekanye. Irangwa na pigmentation ya pigmentation ku matama, mu ruhanga no mu matama, ahanini ikaba ifite amababa y'ibinyugunyugu. Umuhondo wijimye cyangwa umutuku wijimye, umukara wijimye wijimye cyangwa umukara wijimye.
Hafi ya rubanda rugufi rushingiye ku moko no ku moko rushobora kwandura iyi ndwara, ariko uduce dufite UV ikabije, nka Amerika y'Epfo, Aziya, na Afurika, usanga bafite ibibazo byinshi. Benshi mu barwayi barwara indwara bafite imyaka 30 na 40, naho ababana n’imyaka 40 na 50 ni 14% na 16%. Abantu bafite uruhu rworoshye bakura hakiri kare, abantu bafite uruhu rwijimye bakura nyuma, na nyuma yo gucura. Ubushakashatsi bwakozwe ku baturage bake muri Amerika y'Epfo bugaragaza ko 4% kugeza 10%, 50% ku bagore batwite na 10% ku bagabo.
Ukurikije aho ikwirakwizwa, melasma irashobora kugabanywamo amoko 3 yubuvuzi, harimo isura yo hagati (irimo uruhanga, dorsum yizuru, umusaya, nibindi), zygomatike kandi byemewe, kandi umubare wanduye ni 65%, 20 %, na 15%. Byongeye kandi, indwara zimwe na zimwe zuruhu zidasanzwe, nka idiopathic periorbital uruhu pigmentation, zitekereza ko zifitanye isano na melasma. Ukurikije aho melanine yashyizwe mu ruhu, melasma irashobora kugabanywamo ubwoko bwa epidermal, dermal na mixe, muri byo ubwoko bwa epidermal nubwoko bukunze kugaragara, kandi ubwoko buvanze ni bwo bushoboka,Itara ryibitini ingirakamaro mu kumenya ubwoko bwamavuriro. Muri byo, ubwoko bwa epidermal ni umutuku wijimye munsi yumucyo wibiti; ubwoko bwa dermal ni ibara ryerurutse cyangwa ubururu bwerurutse munsi yijisho ryonyine, kandi itandukaniro ntirigaragara munsi yumucyo wibiti. Gutondekanya neza kwa melasma ni ingirakamaro muguhitamo kuvura nyuma.
Igihe cyo kohereza: Gicurasi-06-2022
