Chloasma yog ib qho teeb meem ntawm daim tawv nqaij uas feem ntau pom muaj nyob rau hauv kev kho mob. Feem ntau nws tshwm sim rau cov poj niam uas muaj hnub nyoog yug me nyuam, thiab kuj tuaj yeem pom rau cov txiv neej uas tsis tshua paub. Nws yog tus cwj pwm los ntawm cov xim sib npaug ntawm sab plhu, hauv pliaj thiab sab plhu, feem ntau yog cov duab ntawm tis npauj npaim. Xim daj daj lossis xim av daj, xim av tsaus hnyav lossis xim dub daj.
Yuav luag txhua haiv neeg thiab cov haiv neeg tsawg tuaj yeem mob tau, tab sis thaj chaw uas raug UV ntau heev, xws li Latin America, Asia, thiab Africa, muaj feem ntau dua. Feem ntau ntawm cov neeg mob mob thaum lawv muaj hnub nyoog 30 thiab 40 xyoo, thiab feem ntau ntawm cov neeg hnub nyoog 40 thiab 50 xyoo yog 14% thiab 16%, raws li. Cov neeg tawv nqaij dawb pib mob thaum ntxov, cov neeg tawv nqaij tsaus pib mob tom qab, txawm tias tom qab tas hnub nyoog lawm los xij. Cov kev tshawb fawb los ntawm cov pej xeem me me hauv Latin America qhia tias muaj feem ntau ntawm 4% txog 10%, 50% rau cov poj niam cev xeeb tub thiab 10% rau cov txiv neej.
Raws li qhov chaw ntawm kev faib tawm, melasma tuaj yeem muab faib ua 3 hom kev kho mob, suav nrog nruab nrab lub ntsej muag (uas cuam tshuam nrog lub hauv pliaj, dorsum ntawm lub qhov ntswg, sab plhu, thiab lwm yam), zygomatic thiab mandible, thiab tus nqi tshwm sim yog 65%, 20%, thiab 15%, raws li. 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 tso melanin hauv daim tawv nqaij, melasma tuaj yeem muab faib ua epidermal, dermal thiab mixed hom, ntawm cov epidermal hom yog hom feem ntau, thiab mixed hom yog qhov feem ntau yuav tshwm sim,Lub teeb ntoopab tau rau kev txheeb xyuas cov hom kev kho mob. Ntawm lawv, hom epidermal yog xim av daj hauv qab Wood lub teeb; hom dermal yog xim grey daj lossis xiav daj hauv qab qhov muag liab qab, thiab qhov sib piv tsis pom tseeb hauv qab Wood lub teeb. Kev faib tawm meej ntawm melasma yog qhov zoo rau kev xaiv kev kho mob tom qab.
Lub sijhawm tshaj tawm: Tsib Hlis-06-2022
