Thanks for writing to us.
From the description it seems to be a furuncle
. To treat the same, do warm water compresses twice in a day. Apply a topical antibiotic
cream. Take tablet Brufen
to alleviate pain. With these steps, your lesion should subside. If it does not, visit a doctor as you might need a course of oral antibiotic or incision and drainage
of the area.
Hope that helps. Take care.