Cayce said "Castor oil loves a wound" and I can attest to the veracity of that statement, and then some.
One tip, for starters, since you got a bottle on the way, when using topically and not making a pack/poultice out of it, always remember Less is More. Use one drop at a time, typically, rubbing the one drop into/onto the affected area completely before adding more. The reason for this, if too much is applied to the skin all at once, then a clearing reaction may occur and this can cause a break out.
Use the oil, one drop at a time, to remove moles/cancers, to heal any sort of acne/pimple/cysts, to lessen wrinkles on the face, for superficial scratches on the skin, pretty much anything unwanted, scars can be lessened/removed potentially as well. For an actual wound, use it pretty much like you would an antibiotic ointment, putting it on and around the wound and cover with a bandage. If it is a real bleeder, you may want to wait to apply very much to the wound itself, as it will soften the scab and bleeding may recur, but instead rub it into the skin all around.
Using wool flannel, packs can be made, which are typically used on the abdomen, but can be applied anywhere on the body. There are several protocols to follow with the packs, look up castor oil packs and see what uses they have, and if you need I will be happy to write out the directions for them.
When used on an injury, it does seem to reduce the associated pain rather quickly, even though it has no analgesic properties whatsoever. I believe this is strictly due to the remarkable effectiveness of its healing quartz like properties.
It may be taken internally as well. An adult dose is usually about 2 tablespoons, to be taken on an empty stomach right before bed. It is recommended, if taken internally, to take it 3 days in a row, followed by 3 days off, 3 days on, 3 days off, etc. Alternately, 7 days on, 7 days off. It is a powerful laxative. Once it starts working, sometimes its the 2nd or 3rd day before the "fireworks" happen, but once it starts you will feel like you stepped back ten or twenty years in time, physically speaking. It is seriously amazing. If you have IBS (irritable bowel syndrome) or Chrone's disease, it might not be a good idea to take internally, and do the packs instead. But, barring that, it hugely beneficial. Don't be afraid of the taste, cold pressed and processed oil has almost no flavor to it, it is the hot pressed and pasteurized oil that has that nasty rancid flavor that our grandmothers used to scare us with.