fes·ter 
/ˈfɛstɚ/ verb
fes·ters; fes·tered; fes·ter·ing /ˈfɛstɚ/ verb [no obj] 1 : to become painful and infected
▪ His wounds festered for days before he got medical attention. ▪ a festering sore 2 : to become worse as time passes
▪ His feelings of resentment have festered for years. ▪ We should deal with these problems now instead of allowing them to fester.
▪ His wounds festered for days before he got medical attention. ▪ a festering sore
▪ His feelings of resentment have festered for years. ▪ We should deal with these problems now instead of allowing them to fester.
