I didn't have ass grapes but I had the same thing basically but on my puss. FYI you don't want to KNOW how that bleeds when it tears a tiny bit during childbirth.
Having a varicose vag made me stay home a lot more often in December than I would have otherwise because I hated wearing pants.
Nothing helped and it hurt a lot and it got steadily worse (not rapidly worse though, and it cropped up around 5-6 mos for me). The best thing I can tell you is that it was GONE by 3 weeks post partum. both times. I had one with my first pg too, in pretty much the same place.
you will have that baby any day now and your ass grapes will hopefully vanish with the placenta.