noun, noun or participle which takes 'suru', intransitive verb
Medical term for a skin rash or eruption. Also used as a suru-verb (発疹する) to mean 'to break out in a rash'.
薬の副作用で全身に発疹が出た。
I broke out in a rash all over my body as a side effect of the medicine.
発疹が治るまで、お風呂は控えてください。
Please refrain from bathing until the rash heals.