Just noticed a Callus on my finger, it is on my middle finger . It is definitely not a Wart. The Callus rests on the rubber/plastic finger grip, on all my cameras, even on the DSLR. I do tend to grip the cameras a little too hard. It does not hurt, but I am aware of it. I will have to start putting a plaster on when I use my cameras. Sorry for the dirty fingernail, been in the garden.