hi, I suppose you have swollen gums on that tooth (operculum), It occurs due to food impaction under the gums , it swells up leading to pericoronitis (infection of surrounding gums ) of wisdom tooth
Next Steps
please do not use toothpick and traumatize the tissue , consult nearby dentist and he will start on antibiotics
Health Tips
salt water gargling or chlorhexidine based mouth wash will be helpful