Same damned thing that bit me on the hand and my whole hand puffed up, but
this time it's bitten me right in the middle of my shin. :-(
A 2mm initial bite spot (actually, there are 2 of them, only one has reacted
/very/ badly) has turned into a dark red patch about 2cm across, a raised
bump about 6cm x 10cm. And it aches.