Hi there!
The spot sounds very much like it could be a cyst that's fluctuating. The fluctuating could be due to whatever bacteria is in it at the time.
You should get it biopsied ASAP just to make sure that it's not something more than just a cyst. Cysts can be taken care of by a dermatologist.
I'd suggest going back to your doctor, and telling the doctor everything you've posted including its been 9 months and that the cream didn't help it go away.
Sincerely,
Cindie (Martikadragoon)
CL Dermatology
Hello,
It can be a sebaceous cyst. A sebaceous cyst is a closed sac occurring just under the skin which contains a "pasty" or "cheesy" looking substance called keratin. They may occur anywhere on body but scalp, ears, back, face, and upper arm, are common sites for sebaceous cysts. Blocked sebaceous glands, swollen hair follicles and excessive testosterone production will cause such cysts.
Generally no treatment is required but they become painful then it means they are infected,Then surgical excision by traditional wide excision, minimal excision, and punch biopsy excision may be required.
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 and please do keep me posted on how you are doing.