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One interesting and perhaps important aspect of cortisol is that in most people with psoriasis, cortisol levels drop in response to stress. The drop has been shown to be both short term and medium term, and the drop is most noted in those that find that stress triggers flareups. Also, the researchers noted that cortisol dropped even though there was a rise in ACTH, and that the adrenals seemed to be responding some unknown force.

My research, which I don't have the time or space to explain here, suggest that psoriasis is caused by low cortisol, or more correctly, temporary short periods of time in which cortisol levels are too low to respond to stressed conditions. However, topical cortisol use does more harm than good because it overdoses the skin and does address systemic low cortisol.

If anybody wants the references

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