Skin Burn That Swells Up

Puzzle 12 of Aquarium Easy Pack

Question is: Skin Burn That Swells Up

and the answer is: BLISTER

Word Meaning:

BLISTER — A small bubble between the layers of the skin that contains watery or bloody fluid and is caused by friction and pressure, burning, freezing, chemical irritation, disease, or infection.

Definitions from Wiktionary.

Skin burn that swells up Aquarium Answers | CodyCross Solutions