Liver failure in itself can cause a coagulopathy which can result in petechia. It is not necessarily due to low platelets but is caused by a decrease in other blood clotting proteins.
I'm surprised to hear that you have normal liver enzymes with cirrhosis. I'm really pleased that you have done so well with your treatment. It makes sense that if you have an autoimmune liver problem that you can develop other autoimmune problems as well.
I hope you get some answers soon.
Regards
Chirley
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