The Collaborative International Dictionary of English v.0.48:

Epidermic \Ep`i*der"mic\, a. [Cf. F. ['e]pidermique.]
   Epidermal; connected with the skin or the bark.
   [1913 Webster]

   Epidermic administration of medicine (Med.), the
      application of medicine to the skin by friction.
      [1913 Webster]

WordNet (r) 3.0 (2006):

epidermic
    adj 1: of or relating to a cuticle or cuticula [syn:
           cuticular, epidermal, epidermic, dermal]