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Douglas Harper's Etymology Dictionary
atopic

1923, from atopia (see atopy) + -ic.

Wiktionary
atopic

a. Of a hereditary predisposition towards developing hay fever and other allergic reactions. (i.e. "out of place")

WordNet
Wikipedia

Usage examples of "atopic".

However, through experience, we have learnt that it is more effective in people sensitive to energy, in children suffering from atopic dermatitis, that it acts strongly towards emotions and mood, and that it frequently produces a reaction similar to Mengen's (improvement reaction), which usually manifests itself in Chinese medicine, acupuncture or moxitherapy.

So we can observe many difficult-to-cure cases regarding atopic dermatitis or eczema which have been cured.

Once, there was a case of a patient suffering from atopic dermatitis whose condition suddenly worsened and it was necessary for him to be hospitalized because pus started to appear all over his body, and corporal temperature increased.