WordNet records no synonym and no antonym for contact dermatitis. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a delayed type of allergic reaction of the skin resulting from skin contact with a specific allergen (such as poison ivy)
Synonyms, antonyms and the broader and narrower relations for contact dermatitis come from Princeton University’s WordNet. Full sources and licences.