Here's one to look out for then, especially if you're on blood thinners.
I had a fall off a ladder (broke fibu.la), off to A&E, heading scan etc., all clear so sent home. 2/3 days later, what's that lump in me neck, ruddy 'ell I feel awful, me 'eads thumpin', I got 'ell of a temperature, I'm...