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Our body’s homeostasis changes with ALS. As homeostasis diverts energy to heal ALS damage, it decreases energy for other, less important things. Altering homeostasis is a logical way for the body to balance what is necessary vs. what it can compromise that is less dangerous. I think you may have been fighting off psoriasis for a long time.
Psoriasis is thought to be an immune system problem that causes skin cells to grow faster than usual. The loss of muscle and the energy your body uses to increase neuronal sprouting to stave off atrophy is a higher priority than (autoimmune system) psoriasis. The energy your body used to dedicate to increase fighting off psoriasis is less important. I am not a doctor, but the logic seems to be there.