Milia?

I was at Bay Cities Italian Deli enjoying what could be the perfect meatball sub when I noticed this sign at the shop next door. Now I know what skin tags, moles, and warts are from reading Boy's Life, but I honestly have no clue what Milia are? I will not look it up on the interweb. I refuse to use the same machine that provides me with hours of enjoyment/boobies (thank you tumblr) to learn about something that I clearly have and need removed by a deli slicer. I won't do it.