Allergic to mosquito bites?

Cynthia

So these are pictures i just took..my son got bit by a mosquito yesterday i think one got in the house he was in his play pen...it bit the crap out of him...whenever he gets bit this happens. He has extremely sensitive skin. I know i could put on bug repellent but what else can i use when hes in the house? I am taking him to a allergist Tuesday. I have the johnson creamy baby oil ..Will that be enough? I usually put it on when he goes outside but i guess i have to keep it on him. Do you think hes allergic?