'Twould appear that straining my left wrist around some atypical chords over the weekend (whilst unnecessarily employing a wide-necked classical guitar) has aggravated a previously minor ganglion cyst, which has since swollen considerably. Admittedly, it's still a decidedly weak specimen when placed in direct comparison with those found on various websites about the place.
Pictured below however, it's the weird 'bump' on my wrist (thumb side). Photographing it properly was inexplicably troublesome too, though perhaps this was simply a case of me wanting the photos to lie in their exaggeration of what wasn't actually there ...
Not quite sure of how best to approach its remedy (or, in lieu of this, minimalisation) but I suspect paying greater attention to my arm/wrist position whilst playing and making alterations as necessary will help considerably.
Incidentally, a new demo, aptly named id=10T (though not purposely so) was evacuated into being during the conjuring of this current ganglion's rage.