Mole came back as compound nevus with congenital features. it was a scallop biopsy and the mole regrew in places within 2 months. dr wasn't concerned and said it's normal to see this. should i worry?

Probably not: This is not an uncommon occurrence. Sounds like the shave biopsy did not remove the mole completely. Often times this can lead to re-growth of the mole. If it concerns you, ask to have it completely removed with an excision by either a dermatologist or plastic surgeon.

Compuond nevus, : You have a recurrent nevus. If the diagnosis was compound nevus with congenital features you should not worry. As long as there was not any dysplasia. However pathologic interpretation of a reexcised recurrent nevus can be problematic so if you were to get the regrowth excised be certain the pathologist knows that this is a recurrent lesion after a shave biopsy.