Synonyms of cyst
blisterA blister is a painful swelling on the surface of your skin. Blisters contain a clear liquid and are usually caused by heat or by something repeatedly rubbing your skin.
• The first sign of a blister is itching in the infected area.
sacA sac is a small part of an animal's body, shaped like a little bag. It contains air, liquid, or some other substance.
• The lungs consist of millions of tiny air sacs.
Thesaurus for cyst from the Collins English Thesaurus