The Collaborative International Dictionary of English v.0.48:

Dermatitis \Der`ma*ti"tis\, n. [NL., fr. Gr. de`rma, -atos, skin
   + -itis.] (Med.)
   Inflammation of the skin.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dermatitis
    n 1: inflammation of the skin; skin becomes itchy and may
         develop blisters

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "dermatitis":
   Lombardy leprosy, acne, acne vulgaris, anemia, ariboflavinosis,
   beriberi, cachexia, chlorosis, deficiency anemia, dermamycosis,
   dermatosis, eczema, elephantiasis, epithelioma, erysipelas,
   erythema, exanthem, goiter, greensickness, heat rash, herpes,
   herpes simplex, herpes zoster, hives, impetigo, itch, jungle rot,
   keratomalacia, kwashiorkor, leprosy, lichen, lichen primus, lupus,
   lupus vulgaris, maidism, malnutrition, miliaria, night blindness,
   osteomalacia, osteoporosis, pellagra, pemphigus, pernicious anemia,
   prickly heat, protein deficiency, pruigo, pruritus, psora,
   rachitis, rickets, ringworm, scabies, scurvy, shingles,
   skin cancer, struma, tetter, vitamin deficiency, xerophthalmia