Belladonna

Belladonna Beradonna? is one of the Kuja of Amazon Lily presumably the doctor of the island. She is the one who set Luffy on fire to get rid of the roots of the mushrooms he ate. She also reveals to Luffy that Marguerite was the one to save him when the others amazons were preparing to shoot him. She is later seen by Boa Hancocks side after she suffers from a mysterious disease. Source: One Piece Wikia