Hmm.
Odds are you don't have this, because it's very rare, but
Ehlers Danlos is a genetic disorder where the collagen is defective. "Symptoms can include easy bruising, velvety-smooth skin, mildly hyperextensible skin, and loose, unstable joints."
My mom has it. For her, the symptoms are easy bruising and crooked fingers. It's genetic. Do any of your blood relatives have similar symptoms?