I never bled that much with Humira, and the needle is teeny tiny, so it does not make a big hole. I'd have enough to fill a BandAid from time to time. I do remember bleeding more on my thigh than the abdomen (plus it hurt a heck of a lot more), so I completely avoid the thigh for injections and just use the belly. I have plenty of belly to rotate the site often enough.
But, if you take anything that has anticoagulant properties, you may bleed more than typical (aspirin, ibuprofen or other NSAIDs, fish oil supplements, garlic supplements, the list goes on.
Another suggestion is the ice the site before injection next time. That should help close down the small veins and capillaries. And, of course, you should avoid injecting over any known veins that you see.
Jan