I am guessing Psoriasis is a possibility. Notice all the qualifiers...
My experience with Humira was 18 mos on it to try to close an abdominal fistula (no luck). I went off it just prior to surgery last year (see sig) and immediately got the white patches, other bumpy parts, etc. I now have the official psoriasis diagnosis from a biopsy. It is all over my body - and I mean EVERYwhere - except my face (knock on wood). So months of ointments later I am finally starting light therapy (UV-B) just for a month since summer is coming.
I do believe I had a very mild case of psoriasis prior to starting Humira, and I think it just was exacerbated by the Humira. If you read the side effects, it is listed.
I really hope I am wrong... it is no fun.
sudsmom