Picor anal al caminar

Is it possible to get an itchy anus after taking antibiotics? I had diarrhea a few months ago and since then I had a continuous anal itch. I don’t know what to do. I was diagnosed first with hemorrhoids, had treatment, it seems that there are no more hemorrhoids (doc confirmed) but the itch is still present there (only when I walk for some distance - if I sit down or walk around the house, it doesn’t itch).

Any suggestions are appreciated.