Hello and welcome to HCM Ally.
From your description, it could be many things.
A physical examination and even an ultrasound
will help in establishing a diagnosis. It would be best to consult a surgeon for the same.
If this was not present earlier and has just appeared recently, it could most probably be an abscess
. This is easily treatable, with proper guidance and management by a surgeon or Physician.
I hope I have succeeded in answering your question, you could write back to me anytime for further clarifications. If you want a more detailed diagnosis, you could try our premium section, and upload pictures of your presentation.
Wishing you a speedy recovery. Best wishes.