A few weeks ago I had a small bump appear on my leg that seemed like an ingrown hair, but I couldn't find it. It quickly turned into a shallo crater with the width the size of a dime and a black dot in the middle.
After a day or two the black dot takes over the crater, and the skin around it looks white/red. Elevated at this time, really painful.
The first one I mentioned eventually scabbed over, while still slightly sore it seems to be getting better. However I just had another one appear directly above it.