Hi I’ve noticed a reddish/brown mark on my left arm, it’s been there for about 8 weeks now and it’s getting a bit bigger about 1/2 inch I would think. Now I’ve got a similar one on my right arm, not as big but similar. Is it any cause for concern or do I just keep my eye on it. I am 79 and apart from feeling a little tired, which is unusual, I’m in good health. Thank you.