a way of changing the style of your hair by using chemicals to create curls that last for several months 卷发;烫发 

to have a perm 烫鬈发 I’m thinking of having a perm. 我正在考虑烫发。 You’ll just have to let the perm grow out if you don’t like it. 如果您不喜欢,则只需让烫发长大即可。
Word Origin1920s: abbreviation of permanent.