What is the medical term/name for the little oil bags that accumulates in the facial skin!?

You know.. they look like acne... kinda have the same color of your facial skin, but the come out like pimples when they are oil accumlation in the skin in form of a dot that is removed sugecially by electro surgery.. a 10 mins procedure! What is the name for those oily accumlation in English?|||could be either: Milial cyst (sounds like what you describe), or a hydrocystoma (clear, oil like fluid). Both are harmless.