noun / verb
blister
BLIS-ter/ˈblɪstər/
A small raised bubble in a surface.
A blister forms on her heel where the new shoe rubs.

Etymology
The origin is uncertain, with suggested sources meaning a lump or swelling. The earliest recorded English sense already describes a thin pocket on the skin containing watery fluid.
In context
the blister can actually cause irritation because it's very close to the sensory nerve fibers
More examples
- Heat blistered the painted surface.
- The gardener's hands had several blisters.
- The old coating is beginning to blister.
Forms
blister · blisters · blistered · blistering