Dealing with autoimmune reaction "Lichen Ruber"

[Us3r]

I'm trying to make sense of how to deal with Lichen Ruber, an autonimmune skin disease. It's triggered by stress, both chemical and mechanical. In my own case it followed a SIBO infection, which in turn might have down regulated my metabolism, at least it sustainably down regulated my HRV by 20-40ms measured by my Garmin every night.

Now apart from the obvious, reducing stress where possible and adjusting nutrition to more tolerable foods, I tried to use aspirin to counter the impact of stress, and I felt it works also for the lichen. However, on day three after some 500mg aspirin I tend to get another flare up of the lichen. I looked it up and aspirin is known to be a potential trigger for this disease. The only common treatment for lichen is cortisone cream.
Now how can a disease be caused by stress and cured by stress at the same time? And are there any other things I can do other than putting on a cortisone cream and hope for the best?