I Have Multiple Places On My Legs. Arms, Back That

I have multiple places on my legs. arms, back that appear to be mosquito bites. They are red and itch intermittently - I try not to scratch but have and now they are scabbing. I have tried Benadryl cream, alcohol, aloe vera but they still itch. How can I tell these are mosquito bites and not something else? I did kill a mosquito in my house and my children said they saw 2 as well.