Hi. If you have hemophilia, that bump may be a hematoma, which is a collection of blood underneath the skin. The blood most likely resulted from rupture of some blood vessels in that area. Normally, hematomas resolve within a few days, but if you have a clotting problem like hemophilia, your blood vessels are more fragile and may easily rupture again. This may be the reason why that bump has not disappeared. Since the bump is getting bigger, I really think you should see a doctor about it as soon as possible.
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