Hi Dear, Welcome to HCM. Understanding your concern. Thanks for your query. The numbness and swelling normally occur after injury . The lump you mention in you query can occur due two pssible reasons - Firstly in can be a mucocele that occur due to entrapment of foreign body in duct of salivary gland duct because of injury . - Clot that doesn t resolve yet . The numbness in the lip indicates nerve involvement due to injury . It may take several weeks to recover depending upon the severity . You should avoid playing instrument until the proper recovery of lip because it can aggravate the condition. I would suggest you to consult oral surgeon/dermatologist for proper examination. Doctor may prescribe multivitamin for quick recovery and may perform surgery to correct nerve numbness . For now apply petroleum jelly to keep your lip moist , give cold compresses to lip to reduce swelling and take ibuprofen(if not allergic) or acetaminophen for pain and swelling. Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari