A disease or abnormal condition affecting tissues or structures derived from the ectoderm.
From 'ectoderm' + '-osis' (disease, condition). The '-osis' suffix, inherited from Greek medicine, traditionally marks pathological states, making this term useful for categorizing skin and nerve disorders with embryonic origins.
Many skin diseases doctors treat are actually 'ectodermoses'—meaning they're problems with tissues that all came from that same outer layer of cells in your embryo, so they sometimes share similar treatment approaches.
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