Warfarin users: do you have a rash on your arms that may have been diagnosed as psoriasis?

I have been using Warfarin (coumadin) for years to prevent blood clots caused by a damaged vein.

I developed these round rash marks on my arms that one dermatologist glanced at and called it psoriasis and gave me some cream that he said would reduce their appearance. It had absolutely no effect. Another dermatologist did a biopsy that was unable to diagnose the problem. I have noticed that other people that take blood thinners on a long term basis have similar marks on their arms.

I am wondering if this is an undocumented side effect from the blood thinner. So how many of you have the same problem?