blister · noun C /ˈblɪs.tər/Full view
C2 a painful, raised area of skin with liquid inside, that you get if your skin has been rubbed or burned, or a similar area on a painted surface
Dictionary example:

I've got a blister on my toe.

Learner example:

Some people weren't really walking any more. The blisters and aching muscles gave them too much stress. (Certificate of Proficiency in English; C2; Dutch)

Cambridge University Press