What are blackheads?

And how do I know what they look like?What are blackheads?
Blackheads are pimples that have been on your face too long and have been aging. The longer the pimple stays, without any treatments, they age. The old ones are called blackheads. They are little black dots, that occur where pimples had occur.What are blackheads?
Blackheads are oils and dirt that have clogged a pore in your face. They are black tiny spots in your pores. Sometimes, they are bumpy, sometimes they are not.