I am sorry to hear that. I used to have those '10cents 20cents' as I would get bad reaction from mosquito bites. Perhaps talk to a doctor or dermatologist. When I was young, I frequented Mai Ting Skin clinic. Don't remember if it was any help but the doctor was really kind.
I don't have those scars anymore as an adult. I don't think they are permanent. Prevention is the best. I wear insect repellent whenever I am back in SG.
Maybe u can try on whitening body cream. And u might want to consider on this brand "Labo-uriage" - Cicactive series, which i have purchased recently. The promoter explained to me that this product helps to lighten scar/mark leave on our skin (chicken pox, bruise, birth mark etc...)