Atopic dermatitis affects up to 20% of children in industrialised countries — a rate that has roughly tripled over the past 30 years. In the developing world, rates are far lower. The genetics haven’t changed. The environment has.
The hygiene hypothesis — and its update
The hygiene hypothesis, first proposed by David Strachan in 1989, suggested that reduced childhood infection was causing the immune system to become overreactive to benign stimuli. The updated “old friends” hypothesis refines this: the problem is loss of contact with the microbial companions that co-evolved with us — soil bacteria, parasitic worms (helminths), farm animals, diverse fermented foods.
The immune system developed in a world saturated with these organisms. Their presence actively calibrated the immune response, suppressing excessive inflammatory reactions. Without them, the Th2 arm of the immune system goes unchecked. The skin, gut, and respiratory tract become sites of inflammation that has nowhere else to go.
Skin as external nervous system
What makes atopic dermatitis particularly interesting from an osteopathic perspective is the embryological relationship between skin and nervous system. Both develop from the same tissue layer — the ectoderm. The skin is, in a sense, the nervous system’s external face. Chronic skin inflammation is rarely just a skin problem; it reflects a systemic dysregulation connecting the autonomic nervous system, the gut, and the stress response.
What this means at OQ
At OQ, skin conditions including atopic dermatitis are approached through the whole-system lens. We are not dermatologists and do not treat skin directly. But patients with chronic skin conditions often have concurrent autonomic, digestive, and structural patterns that osteopathic care can address.
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