Source : Webster's Revised Unabridged Dictionary (1913)

Acne \Ac"ne\, n. [NL., prob. a corruption of Gr. ?] (Med.)
   A pustular affection of the skin, due to changes in the
   sebaceous glands.

Source : WordNet®

acne
     n : an inflammatory disease involving the sebaceous glands of
         the skin; characterized by papules or pustules or
         comedones