Hello, I have a ball bearing sized, firm, nodule that
Seems to be a cyst - wait and watch policy.
Thanks for your query.
Noted the history well and understood the concerns.
Such a swelling as described by you looks to be a cyst.
Since you have noticed it a week ago and have no symptoms means it is not infected.
Hence you can wait and watch the progress.
It may resolve on its own.
If you develop any increase in size or start with any symptoms like pain or so, please consult a General Surgeon for an actual examination - per-rectal digital examination and ano-proctoscopy to know the exact diagnosis and get treated accordingly.
I hope this answer helps you.
Let me know if you have any further queries and better give feedback after a few days.
Dr T Chandrakant