A lump or swelling on the skin such as a boil, blister, or pimple; a common everyday term (see also できもの).
背中に大きなおできができたので病院へ行った。
I went to the hospital because a large boil appeared on my back.
赤く腫れているおできには触らないでください。
Please don't touch the red, swollen pimple.
薬を塗ればおできは数日で治ることが多い。
Applying medicine often cures a boil/pimple in a few days.