From the attached picture, it looks like you have a partially erupted molar tooth with irritated mucosa around it. Please consult online to get a better idea about your issue and to see the growth clearly. It is also important to note how long the growth has been troubling you.
If it is just the tooth which is causing issues then you may need to meet with a Dentist.
Next Steps
Gargle with warm salt water. Chew food on the opposite side. Apply Zytee gel over the area until you either meet a specialist/ show online.
Health Tips
Avoid smoking, Chewing Paan, oily and spicy food. Have a soft, bland diet.