Thank you and welcome to HCM
From your description, there are different possibilities of painful swelling beneath the skin with no discoloration. Normally it would have been proper for me to be able to see the swelling and examine it before I can conclude. But non the less, that does not stop us from thinking of the various possibilities.
We could have
- A sebaceous cyst
Right now, you will need to visit a surgeon so that he can examine and probably do a biopsy
of the mass or decide directly on surgical excision of the mass in case he/she thinks is a cyst or benign mass. If abscess, then appropriate antibiotics will need to be given and pain killer.
Hope this helps