Hi, Sarah, Warts are 疣 (you2). And is it actually "dermatologist" you were trying to say? If so, it's 皮膚科醫生/皮肤科医生 (pi2　fu1　ke1　yi1　sheng1). You can change 醫生/医生 to 醫師/医师 (yi1　shi1) as well.