Welcome to the ehealthforum and I am really glad to help you out.
It can be a myxoid cyst. If the bump is painful then herpetic whitlow is to be ruled out. Myxoid cyst is a growth usually occurring on the finger. These cysts are believed to form from deteriorated tissues.
Herpetic whitlow is a painful viral infection occurring on the fingers or around the fingernails and is caused by infection with the herpes simplex virus (HSV).
I sincerely advise you to consult a dermatologist and get it examined.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.
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