L.V.
I would call the pediatrician and try to get it looked at, better safe than sorry. My daughter bumped her toe on a toy last year, the next day it was red and swollen and then a red line started going up her foot. I had to take her to the emergency room because she developed an infection. Antibiotics cleard it right up, but I wouldn't have even thought to take her in if I hadn't called the doctor.