Hi, about a month ago I first noticed a bump on my foot. It's on the right hand side under my right foot, just on the edge of the thick skin from my heel. It's only about a centimetre round and when you look from the side it only protrudes a milimetre or two (not unlike the size of a mosquito bite). It's uncomfortable to walk barefoot, although I don't feel it when I have shoes on. Squeezing or pressing on it hurts as though there's something sharp in there. The skin is very slightly darker on the bump, but no darker than the natural variation around my heel.
Our first thought was a splinter working its way out as I do like to walk barefoot, but I'd have expected that to have pus around it? This skin is solid, like a corn or something. But the really disturbing this is that there's a hole in the centre. You barely even see it, it's only a milimetre or two across and it it looks like another piece of shedding skin on my feet at the moment. But last night I stuck some needle nosed tweezers in to see if I could find a splinter etc, and they went in 3-4mm before hitting the bottom. I don't recall the hole being there to start with, so I think it may be growing. There's no blood or pus or anything coming out, but it may be that it's actually like a deep blister that the thick skin is masking. Now I've found the hole I'm worried that there's an infection or a parasite burrowing into me although there's nothing to see :/
Would a splinter behave that way? Anyone have any other ideas?