My daughter has a bite on her leg and her arm..it was a little bubble at first and looked like…

My daughter has a bite on her leg and her arm..it was a little bubble at first and looked like liquid inside..then it went down and looked like it was going away and yesterday I noticed it looked worse and now has those little bumps all around and its dry..is it a allergic reaction has this happened to any of your little ones? I don't think it's a spider bite..maybe fleas or mosquitos? I'm going to call tomorrow to make a appointment at her ped..