The better dermatologists are certainly in Santiago or Santo Domingo.,
I would suggest Doctor Belkis Martínez (809 580 1171 x 7238). She has treated our family for years. Dr. Rafael Díaz Mercado, not bi-lingual to my knowledge, is also a very good dermatologist. He's at extension 7303. Both are at the Clinica Corominas in Santiago.
These are the doctors that Dominicans seek out.
HB