A few weeks back I had a raised bump on my index finger that itched like mad - the itchiness went
straight down my
finger too. I could feel the bump, but
not see it unless I flexed my
finger which made the skin over the bump turn white, but then return to flesh color after (like if you press down on some part of your skin and release - the area is white for a second and then returns to its normal color).
The bump wasn't fleshy or filled with any fluid.