Gumboil/ˈɡʌmbɔɪl/ Definition 1 of 1Pro Tip 1/3Painful Condition Gumboil refers to a sore and inflamed area, causing discomfort. He groaned, touching the tender gumboil with his tongue. Pro Tip 2/3Infection Origin Gumboils result from infections, often related to teeth problems. After ignoring her cavity, she ended up with a gumboil. Pro Tip 3/3Treatment Suggestion When someone has a gumboil, seeking dental advice is implied. The dentist prescribed antibiotics for his gumboil.