Etymology
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fester (v.)

late 14c., of wounds, "to become ulcerous, suppurate," from festre (n.) "a fistula" (c. 1300), or from Old French verb festrir "ulcerate, fester," from festre (n.) "small sore discharging pus." The nouns in Old French and Middle English both are from Latin fistula "pipe, ulcer" (see fistula). Related: Festered; festering; festerment.

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Definitions of fester
1
fester (v.)
ripen and generate pus;
her wounds are festering
Synonyms: maturate / suppurate
2
fester (n.)
a sore that has become inflamed and formed pus;
Synonyms: suppurating sore
From wordnet.princeton.edu