Suggest Treatment For The Marks Of Mosquito Bites On Skin

i have a ton of mosquito bites on my legs, nothing has been working. i used aloe vera, OTC cortisone, salt, hot towels, prescription cortisone cream, antibiotics. i couldn't take it anymore and i squeezed all of my bites. what can i do now to make sure i don't get scars and to alleviate the itching? how long can i expect these bites to be around? i got them over a week ago at yosemite national park. any info/advice would be appreciated.