to erupt in a rash
"発疹"
Hives.
発疹? 何言ってるの?
What are you talking about?
発熱 発疹 咽喉痛 吐き気 筋肉痛 関節痛 リンパ節腫脹...
Fever, sweats, rash, sore throat, nausea, vomiting, myalgia, arthralgia, lymphadenopathy...