できもの
できもの · dekimono · JLPT N1 · noun
boil
🩹 出来 (deki) = come out/form + 物 (mono) = thing: a skin bump that has come out
出来 is the same verb stem as できる (to be made, to come into being). Anything that forms on the skin, like a boil or rash, is simply a thing that came out.