Pustule (noun)

A small, raised blister on the skin that contains pus.

Origin:

Late 16th century: from latin pustula, from pustulus "pimple", diminutive of pustus "swelling".

Examples:

1. The pustule on her skin was red and swollen.
2. The pustule was caused by a bacterial infection.
3. The pustule was drained by a doctor and the wound was cleaned.
4. The patient had a number of pustules on their skin, indicating a severe skin infection.
5. The pustules were swollen and painful, and the area around them was red and inflamed.