Pústula is a medical term that refers to a small, inflamed area on the skin containing pus. Synonyms for this word include blemish, spot, blister, sore, abscess, pimple, and lump. These words are often used interchangeably to describe various skin conditions that cause inflammation and irritation. Blemish is a general term for any kind of skin imperfection, while a spot refers to a small, round mark or blotch. A blister is a raised area filled with fluid, while an abscess is a collection of pus that can form anywhere in the body. Pimple and lump are both used to describe small, raised bumps on the skin that may or may not contain pus.