Sue, I have located a discussion in the autoimmune group.
Autoimmune Diseases > Psoriatic Arthritis
https://connect.mayoclinic.org/discussion/psoriatic-arthritis-257d5c/

Your friend can read thru the posts. I encourage him to join Connect as a member, because then he can actively participate by asking questions that relate to his concerns. He is also welcome to the Transplant group where some members have experienced other autoimmune related conditions that developd into organ failure. .
Regardless of the source/cause for liver failure, we all share similar fears, and symptoms. He is welcome to join us anytime. He does not need to be alone. And, Sue, you are also welcome. I admire your dedication to helping your friend.