pustule

He is a gangrenous pustule of pain.

It involved deliberately infecting someone with the disease by pricking someone else’s smallpox pustule, removing some pus, and placing that pus inside an incision on the recipient’s arm or thigh.

Having had the displeasure of covering his presidency in its entirety, I can honestly say I've never met a more loathsome, cancerous pustule of a human being, a man so narcissistic that for him the rest of the universe exists solely to pander to his needs.

Each pustule contains live virus, and a ruptured blister can contaminate bed linens and other items, putting close contacts at risk.

A case of this kind has recently occurred with a student of medicine at Bellevue Hospital, who only succeeded in producing a true vaccine pustule at the third attempt, the time elapsing between each trial being only long enough to determine that the preceding one had failed.