Dermatologist

[,dɜːmə'tɒlədʒɪst] or ['dɝmə'tɑlədʒɪst]

(noun.) a doctor who specializes in the physiology and pathology of the skin.

Editor: Wendell--From WordNet

(n.) One who discourses on the skin and its diseases; one versed in dermatology.

Checker: Prudence