Cov tawv nqaij tawv nqaij pigment metabolism - chloasma

Chloasma yog ib hom kab mob ntawm daim tawv nqaij pigmentation hauv kev kho mob.Nws feem ntau tshwm sim hauv cov poj niam uas muaj hnub nyoog yug me nyuam, thiab tuaj yeem pom hauv cov txiv neej tsis paub.Nws yog tus cwj pwm los ntawm symmetrical pigmentation ntawm lub puab tsaig, hauv pliaj thiab lub puab tsaig, feem ntau nyob rau hauv cov duab ntawm npauj npaim tis.Lub teeb daj lossis lub teeb xim av, hnyav xim av lossis lub teeb dub.

Yuav luag txhua haiv neeg thiab haiv neeg tsawg tuaj yeem tsim tus kab mob no, tab sis thaj chaw uas muaj UV raug mob hnyav, xws li Latin America, Asia, thiab Africa, muaj qhov tshwm sim ntau dua.Feem ntau ntawm cov neeg mob tsim cov kab mob hauv lawv 30s thiab 40s, thiab qhov tshwm sim hauv 40- thiab 50 xyoo yog 14% thiab 16%, feem.Cov tawv nqaij tawv tawv pib tshwm sim thaum ntxov, cov tawv nqaij tawv tawv tshwm sim tom qab, txawm tias tom qab lub cev tsis muaj zog.Kev soj ntsuam los ntawm cov neeg me hauv Latin America qhia tias muaj qhov tshwm sim ntawm 4% txog 10%, 50% ntawm cov poj niam cev xeeb tub thiab 10% ntawm cov txiv neej.

Raws li qhov chaw ntawm kev faib tawm, melasma tuaj yeem muab faib ua 3 hom kev kho mob, suav nrog lub ntsej muag nruab nrab (nrog rau lub hauv pliaj, dorsum ntawm lub qhov ntswg, lub puab tsaig, thiab lwm yam), zygomatic thiab mandible, thiab qhov tshwm sim yog 65%, 20. %, thiab 15%, feem.Tsis tas li ntawd, qee cov kab mob ntawm daim tawv nqaij idiopathic, xws li idiopathic periorbital daim tawv nqaij pigmentation, xav tias yuav cuam tshuam nrog melasma.Raws li qhov chaw deposition ntawm melanin nyob rau hauv daim tawv nqaij, melasma yuav muab faib ua epidermal, dermal thiab mixed hom, ntawm cov epidermal hom yog cov feem ntau hom, thiab mixed hom yog feem ntau yuav,Ntoo lub teebyog pab tau rau kev txheeb xyuas cov hom kev kho mob.Ntawm lawv, hom epidermal yog lub teeb xim av hauv qab Ntoo lub teeb;hom dermal yog lub teeb grey lossis lub teeb xiav nyob rau hauv qhov muag liab qab, thiab qhov sib txawv tsis pom tseeb nyob rau hauv Ntoo lub teeb.Kev faib tawm ntawm melasma yog qhov zoo rau kev xaiv kev kho mob tom qab.