blis·ter 
/ˈblɪstɚ/ noun
plural blis·ters /ˈblɪstɚ/ noun [count] 1 : a raised area on the skin that contains clear liquid and that is caused by injury to the skin
▪ She developed a blister on her heel where her shoe rubbed against it. 2 : a raised area on a surface (such as a painted wall) that is filled with air
▪ She developed a blister on her heel where her shoe rubbed against it.
— blister verb, blisters; blistered; blister·ing
[no obj] ▪ My feet started to blister. [=to form blisters] ▪ The paint cracked and blistered. [+ obj] ▪ Her skin was blistered by the hot sun.
[no obj] ▪ My feet started to blister. [=to form blisters] ▪ The paint cracked and blistered. [+ obj] ▪ Her skin was blistered by the hot sun.
