Source : Webster's Revised Unabridged Dictionary (1913)

Dermatitis \Der`ma*ti"tis\, n. [NL., fr. Gr. de`rma, -atos, skin
   + -itis.] (Med.)
   Inflammation of the skin.

Source : WordNet®

dermatitis
     n : inflammation of the skin; skin becomes itchy and may develop
         blisters