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Hi there!There are several possibilities, based on your description:1. Hair follicle cyst (benign)2. Glandular cyst (benign)3. Mast cell tumor (cancerous)4. Cutaneous histiocytoma (benign)5. Sarcoma (cancerous)6. Adenocarcinoma (cancerous)Only a biopsy can differentiate between the types and because some are potentially cancerous, I would not wait long to get a biopsy done. This can be done relatively quickly and inexpensively via what's called a fine needle aspirate that does not require surgery/anesthesia.Hope this helps!
There are no red flags. Even a small innocent looking bump could be cancer. I would not wait to see if it gets bigger - get it biopsied! If it's benign, no big deal, but if it's not, you'll lose valuable time if you don't find out now.
Hi again, checking in to see if you have any additional questions that have come up! Please be sure to rate my answers if you've found them helpful and let me know if there is something else I can help with. Thanks!