My husband started having purple toes over a year ago, his two great toes got large sores on them , they were removed last Dec., he has good circulation, actually had a test for circulation today, now has sores on two more toes, he has RA, and CHF, among his medications are Coumadin and Amiodarone could either one of the cause the sores? He does not have sugar either.No Dr. can tell us what is causing the sores.