Quinsy, also known as a peritonsillar abscess, is a complication of tonsillitis that is left untreated.
The abscess (collection of pus) forms between one of your tonsils and the wall of your throat. This can happen when an infection spreads from an infected tonsil to the surrounding area.
Symptoms of quinsy can include:
a worsening sore throat, usually on one side,
a high temperature of 38C (100.4F) or above,
difficulty opening your mouth,
pain when swallowing,
difficulty swallowing, which may lead to drooling saliva,
changes to your voice or difficulty speaking,
earache on the affected side,
headache and feeling generally unwell,
swelling around your face and neck.