break out in
phrasal verbbreak out in something 
- to suddenly be affected by an unpleasant feeling or problem on your skin突然布满某物 - Her face broke out in a rash.她脸上突然长出一片红疹。 
- He broke out in a cold sweat (= for example, through fear).他突然冒出一身冷汗。 
 
- Her face broke out in a rash.