Hello, You may have a clogged saliva duct. if you have a hard, calcified stone, it may pass, if small. Massage the area gently for release of pressure. A larger blockage may require a trip to your dentist or oral surgeon for removal. Trauma, an allergic reaction or too much spicy food may resolve with avoidance of all irritants and gentle rinsing with salt water. Antiinflammitory medications may help as well. Consider salivary gland disorders or tumor if swelling increases or tissue change is evident. Your dentist should be able to advise you on needed additional steps. Thank you for your inquiry. I hope you have luck with my basic suggestions, if not, Schefule a dental visit.