I've never heard of Infliximab BUT I do take Celebrex for a skin related issue. Celebrex is another anti-inflammatory. It's not used to treat people with psoriasis as far as I know but a rheumatologist put me on it because he theorized the reason I have so much joint pain is because my skin swells when it's dry, and since it doesn't strecht (lamellar icthyosis) it ends up swelling inward and compacting my soft tissues which then hurts my joints. He came to this conclusion because he says a lot of people with skin conditions have a great deal of joint pain for the same reason (internal swelling), and because I've had such severe joint pain it can inhibit my ability to move around quite a bit. It helps me move better, but I haven't seen it affect my skin at all in terms of peeling, looks, etc.
I am female, and was born in 1972 with Lamellar Ichthyosis.