New tiny mole appearing from place of an excised mole (which was mildly dysplastic). Re-excise? Other moles are ok. (photo)
Doctor Answers 1
Recurrent dysplastic nevus requires removal
Recurrent dysplastic nevi should be removed. The current medical understanding is that dysplasia represents and early pre-cancerous change. Your prior surgery appears to have been preformed by shave excision. Mole (nevus) cells tend to penetrate deeper into the skin than many shave excisions are able to remove, so probably some of the cells got left behind.
I would recommend returning to your surgeon or seeking a second opinion regarding re-excision of the mole.