I get a rash around my mouth from wearing a mask and sweating.
My skin breaks out around my mouth because I get so hot and sweaty from wearing a mask all the time.
ーI get a rash around my mouth from wearing a mask and sweating.
「マスクをして汗をかくから口の周りに汗疹ができる」
to get a rash from sweating で「汗疹ができる」
to wear a mask で「マスクをつける」
ーMy skin breaks out around my mouth because I get so hot and sweaty from wearing a mask all the time.
「ずっとマスクをして蒸れるから口の周りに発疹ができる」
to break out で「（発疹・ニキビが）出る」
to get hot and sweaty で「蒸れる」
ご参考まで！
カナダ 
