My son is 4 months old and I just noticed some red marks on his arm this evening. I picked him up out of his crib, and saw that he slept on his arm with the indentions of the blanket. So I didn't think anything of it until later when I saw the lines. I thought that it was scratches at first but there is no sign of penetration of the skin's surface. I am concerned and debating of whether or not to go to the prompt care unit tonight. My two older kids have been known of ruptured blood vessels in their past as babies, but not as long as the one on my youngest. What should I do? He's not acting like anything is wrong. Will this clotting travel in his body to his heart or brain?