You know what, gonna take this saltiness as a moment to do a bit of raising cancer awareness, because there are five warning signs of a mole being melanoma and this fucker, pictured with the genuine markup that doctors use to tell the surgeon what to remove, had FOUR of them (and I knew it was dodgy and needed to come off, it just took ages etc etc).
The warning signs have a neat acronym: ABCDE.
A = asymmetry. Normal moles are pretty symmetrical, the dodgy ones are a weird shape.
B = borders. Normal moles have a pretty well-defined border. Dodgy ones like mine have hazy borders. If you zoom in on mine, it looks smudgy round the edges.
C = colour. Normal moles are mostly a pretty even colour. Dodgy ones have varied colours. Mine had a much darker patch.