I took my 2 year old to the park and she came back with what looked like a mosquito bite. I disinfected it with alcohol. She complained about it but I thought it would heal on its own.However a few days ago I noticed there was a big bump where the mosquito had bitten her.I continued to disinfect the bite.This morning she woke up with what appears like a bruise.Her foot is swollen around the bite and a blue and purple color has spread all around her foot. She seems to be experiencing some discomfort. What should I do? Could this be from something other than a mosquito?