....that I wish you saw, Sarcastic Mr know it all*
Had the same pain after knackering a finger (damaged pulley) and leaving it to for a few weeks to recover - was told to friction massage it, and did, often and quite painfully and it definitely worked. Use a bit of oil or something to lubricate it, and work it with a flat thumb. Usual disclaimers apply as for any medical advice.
*RHCP reference, not you, and I won't put the next line.