Hello, since this is an extra-oral picture showing the cheek from outside, we can not comment on your condition in the absence of pictures of inside mouth. None the less, the swelling is appreciable and I suspect any decayed tooth inside the mouth on the same side.
I would strongly advise you to consult a dentist in person to get treatment at the earliest to avoid any further damage.
Also pls refrain from using any home remedy, it can exaggerate your problem.
T.C
Next Steps
Consult a dentist at the earliest without any further delay.
Health Tips
Pls dont use any home remedy.