What Causes Reddish Blotches On The Body While Taking Caumadin?

I have a considerable amount of reddish large blotches on my body. I take coumadin for a bunch of years. Could there be a connection? I had a valve replacement 3 years ago and have been on coumadin prior to that for atrial fib. I am 67 and am very overweight. I take thyroid med for hypothyroidism and also am taking caduet