I went to hematologist about these and he found I am deficient in vitamin c that builds collagen. I have many food intolerances and ibs, so that makes sense. I have been supplementing with buffered C for a few months, and my arms were briefly clear, then I caught Covid for first time and now the blood spots arise again at the slightest pressure from brushing against surfaces and the skin tears too easily. With spring gardening starting up I have to remember to wear the arm sleeves because my arms are a mess from brushing up against foliage! I’m only 66 and worry about the state of my skin over the next decades!