Apparently it’s not unheard of for epidermoid cysts to have little particles of calcium.
Now, the cheesy, sebaceous substance that fills the cyst makes perfect sense to me – it stands to reason that the blocked gland produces sebum, and various and sundry epithelial cells end up there as well. Add a few bacteria, some white blood cells, and you get the fetid substance that cysts normally have.
The idea that somehow the body deposits calcium there weirds me out, no end. Why would that happen?