I use to have scabies, but I still have the scars and lil bumps. Why?

Thats how scars beha. You have scars of various stages of maturations.When you had scabies you created ulcers by itching.More you itched more you made it worse interms of depths.Deeper thhe ulcer more is the scarring, with tome some of these improve it terms of nodularity and color and some will last for ever., unless you seek treatment.
Treatment? If you were treated adequately marks will disappear. If you are still itchy discuss with doctor one more application .Topical steroids will help resolve residual marks left after scabies.