If you or someone you love has been diagnosed with an osteochondroma, you already know the unsettling experience of being told it is probably benign and to wait and see. That advice is not wrong, but it often leaves people without a clear framework for monitoring their condition intelligently.

Erythema nodosum doesn't arrive quietly. One morning you notice warm, tender nodules on your shins — sometimes on the forearms or elsewhere — that are deep red, painful to press, and alarming enough to prompt a doctor visit.