Hello, Thanks for your query. Although the scar marks caused by insect bite generally vanish of with the time as the skin used to change itself with time.There are following treatment which you cane use- 1.Use alpha hydroxy acid which are available OTC.These are derivatives of fruit juices & increase the exfoliative process. 2.Apply aloe vera juice on these scar marks & leave it for about i-2 hour .Do it for 2-3 times a day. 3.Use VIT.E local applicable lotions. 4.Visit to a dermatologist .If marks are darker then he may prescribe you some depigmentation creams or suggest you some dermabrasion surgery or laser. I do hope that you have found something helpful and I will be glad to answer any further query. Take care