Pomona Sprout: "An excellent remedy for the more stubborn forms of acne, bubotuber pus. Should stop students resorting to desperate measures to rid themselves of pimples."
Hannah Abbott: "Like poor Eloise Midgen. She tried to curse hers off."
Pomona Sprout "Silly girl. But Madam Pomfrey fixed her nose back on in the end."
- Pomona Sprout and Hannah Abbott discuss Eloise Midgen's acne.

Acne is an infection of the skin, caused by changes in the sebaceous glands which usually happen during puberty. Acne can be treated with a solution of Bubotuber pus.

Acne is also part of a Mandrake's maturing cycle; once their acne has cleared up they are ready for repotting and after they reach maturity.

Eloise Midgen was known to have a bad case of acne and many of her colleagues and professors at Hogwarts School used her as the standard against which really bad acne was to be measured.