How do you get rid of mosquito bite scars?

So I have some GIANT mosquito bites on my legs. I have pretty pale skin, so when I get bitten the bites get really big and purple/red, even if I don't scratch and take things like Benadryl. I've been icing the bites and putting on cortisone cream but I'm looking for ways to reduce the scarring and make my legs look less gross. Anyone from a tropical climate or anyplace with a lot of mosquitoes who knows how to handle this stuff? What can I do??