A few weeks ago, i bit my lip very hard. since then, i have developed a large ball in my lip. it's hard and uncomfortable. help there is no pain. but my lip sticks out more. it's about the size of a gumball.

You : You may have severed a small duct of a mucous gland when you bit your lip. The mucous will spill into the soft part of your lip. It is called a mucocele. Make an appointment with an oral surgeon to have it evaluated.

Mucocele: Rupture of minor salivary gland or salivary gland duct in your lips will cause the salivary deposit into soft tissue and resulting in bluish or colorless swollen ball which is called mucocele. Mucocele although painless can cause lip biting during function. Schedule your mucocele removal with your dentist/surgeon. Make sure to post op to check any other mucocele developed in the area of surgery.