For the past 2 weeks I’ve had painful burning sensation?

For the past 2 weeks I’ve had painful burning sensation from my ass cheeks near the anus. I’ve tried to put some different hydrocortisone creams on it but it doesn’t help. It mainly bothers me while sitting. Walking around does not effect it. I keep the area very clean. I use a toilet bidet every time that I defecate.
Thank you

Age: 89
Male
Medications: Plavix, Simvastatin,
General Information: I recently underwent a double heart bypass surgery. (About 2 months ago.)

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