Any easy bruising would not be due to a short course of Coumadin years ago.

He should have a medical workup to rule out some type of clotting disorder (such as a low platelet count or clotting factor deficiency).

Many herbs can affect blood clotting and make bruising easier - ginseng, chamomile ans quite a few others.

If he's still bruising easily, you need to ask his doctor about it, AND bring in EVERY herb and supplement you are taking.