A tumour resolves.
腫れ物が膿んだ
A tumour forms―appears―makes its appearance―on some part of the body.
腫れ物から膿が出る
A boil runs matter―discharges matter.
a localized inflammatory swelling of the skin and underlying tissues caused by a bacterial infection, called furuncle
a sore that has become inflamed and formed pus
a painful sore with a hard core filled with pus