I'm anemic and what's strange is that you said you get these bruises only when you're on a cycle and your whole shoulder turned completly black and blue? If you're anemic, you fatigue very easily, you're pale, you bruise, you get tired for no reason, and sometimes get lethargic. But never has a large section of my shoulder turned completly black and blue. Also, this doesn't happen when you're off a cycle. Not trying to alarm you, but I would explain it to a doctor. For some reason your capillaries are randomly collapsing or breaking while on a cycle. Sounds like a sort of reaction you're having. If you had a hemoglobin deficiency, you would have had it since childhood. What gear are you taking now, and is it the same gear during other incidents of bruising?