Our Sheba did this slightly....

If they have dry skin back there, or fleas, it itches them quite a bit. Also when the a n a l glands become problematic, they can react this way.... when really severe, they will turn and BITE you.

Using foods with Omega-3's really reduce this behavior. So much of the skin problems relate to CORN in food...IMO. Sheba had sores on her face from corn.

What is really spooky about food, is this:
We fed both Sheba and Tippy with Eukanuba for about 10 yrs.
They lived long lives as a result (20 and over). When Sheba was diagnosed with beginning kidney problems in June 10 we switched to Science Diet Mature longevity... to reduce the phosphate and magnesium. By a coincidence IAMs shut down production of their foods around that time as well (they had contamination issues with salmonella). Both of our cats, died within 3mos of each other with the food change (Sheba in Oct 10 and Tippy in 1-11). Granted they were OLD...but it seemed rather dramatic to me. Now Eukanuba is back, and I have reinstated it here. I keep a small bowl of kibble upstairs during the night... for Weezie. She uses it every day. She is afraid to go downstairs without us...she is till worried about Oreo.
Little Weezie really LOVES Fancy Feast crunchies...so we buy them for her, and mix with Eukanuba kitten. I had bought them as a trial for Tippy...who wouldn't eat them.

YouTube has many cat videos displaying this same behavior. People think it is "funny" but it really demonstrates a need for a health change for the cat.