Hopefully not or it could be a phantom Flare, I know I.ve had one and two real spreads.
The Phantom one started in my right ankle all the claasic signs but no trauma of any sort one moment prefectly ok then it just started. 4 days later it disappeared again. Both real ones started after a very small incident.
Thinik hard have you suffered even the slightest knock, where is the drain what surgery.