Hi, I am a 55 y.o. white female in good health, but I do take levothroxine, and zoloft . This past Monday evening, I noticed that my two far left knucles on my left hand were red, and that there is a large bruise underneath thenm on my hand. It is not tender, and I did not bang or hit my hand on anything. Today is Thursday and it has not faded. I did sustain a small cut while working out in my yard just about a half inch from this bruise, but there is no redness, tenderness or infection. Any ideas what might be causing this? (I have had a recent physical about 2 months ago, and have no blodd disorders or serious health issues.) Thank you!