I agree with the others, if it's only small and the bleeding has stopped, I wouldn't worry too much unless a few days go by and it doesn't seem to be healing. It's a tricky spot to get a plaster to stick on tho!
Maya cut her foot on a piece of glass at the beach when she was 2. It was quite deep and bled quite a lot but was a nice, clean cut so I didn't take her to the doctor. It healed up nicely, but a few months later there was still a lump under the skin and she was still limping on it a bit so I took her to the doc and it turned out that she had some grains of sand that had healed inside the wound

. It took an xray and ultrasound to work that out, then she had to see an orthopaedic surgeon and have surgery to remove it and was in plaster for six weeks. made me feel like such a bad mummy for not taking her at the time it happened!