C.A.
WOW - I love this website. Makes you feel like you're not alone. I thought it was just my daughter who has this problem!! We have tried Bactine (antiseptic/numbing spray), Neosporin, Off for kids, calamine lotion & nothing works. The one cream my pharmacist recommended was Aveeno Anti-Itch cream with calamine 3%, oatmeal & Pramoxine HCl 1% in it. It seems to work the best so far as length of time with no itch. The pharmacist said not to use too much cortisone cream since it's a steroid.
I also finally took my daughter who is 2 1/2 to the ped. just to make sure it wasn't something else. He said some kids just have an allergic reaction to bug bites with welts and blisters. He said to give her a 1/2 tab of the children's Benadryl 3 times a day until it's resolved. I only give it to her before her nap & before she goes to bed at nite since she scratches more in her sleep. It has REALLY helped along with the Aveeno cream. The welts have gone down & she's not itching constantly now. Good luck!! Hope you figure out what works for you & let us know if it's different. :o)