Blister (noun)

1. A small fluid-filled sac that forms on the skin as a result of irritation or injury.
2. A raised area on the skin filled with fluid.

Origin:

The word blister comes from the old english word "blistra" which means a bubble or a blister. it refers to a small fluid-filled sac that forms on the skin as a result of irritation or injury.

Examples:

1. He got a blister on his foot from walking in new shoes.
2. She had a blister on her hand from using the new racket.
3. The blister burst and the fluid drained out.
4. The blister was caused by friction from the shoe.
5. Blisters are common when breaking in new shoes.