The area shows slight inflammation.
Take anti inflammatory medicines for 3 days.
Maintain oral hygiene and use a mouthwash one daily.
Apply a topical oral ointment( Orasore, Mucopain, etc) thrice daily for a week and avoid having spicy, hard and extremely hot food substances for 3-5 days.
Next Steps
If there is no improvement even after 5 days, visit a nearby dentist for physical evaluation.