It is concerning if your rabbit is actually biting and chewing at the site, rather than just grooming it. Wick groomed his (clean off dried blood and such), but afterwards he stopped. If you find he’s constantly going at the site, then I would suggest a collar. It may be less stressful if you let it be off for periods of time.
Were you given pain medication? I’m wondering if the area is being irritating and this is his reaction.
And you do need to check the site each day to make sure it’s healing correctly. What I do is use one hand to lift the front paws and the other hand lifting up the butt from below (not the back legs), and with Wick’s back leaning on my chest, I tilt the butt up so I can see the area.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.