There can be a number of causes pertaining to such swelling. it can be infection or it can also be muscle pull. I would advise you to take tablet zerodol SP 1 Tablet 2 times a day for 5 days and tablet Pantocid 40 mg 1 tablet once daily empty stomach for 5 days. If problem persists even after this then consulta Gastroenterologist.
Next Steps
if there is the redness in that area then get an ultrasound abdomen done along with the breast mammography.
Health Tips
take rest and drink Cranberry juice.