I'm sorry you are worried about this. I will try to help.
Without a local examination or a pic., I can only give a general answer on this platform, but I hope it helps.
It is most likely infected, as it is painful.
You will require antibiotics to cure the infection.
You may start OTC Ibuprofen 200mg three times a day.
These will reduce inflammation and pain.
It is prudent to see your GP and start antibiotics.
After local examination, further management can be planned.
Please let me know if this was helpful.
In case you require any further assistance, do not hesitate to contact me. I am happy to help!
Wishing you the very best in life.
Thank you for the opportunity to help.
Positive feedback is requested.