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What are the differences between blackheads and or whiteheads? Are different types of oils (sebaceous) involved? Or are they irritated by different things? Or does one become a pimple? And the other one is more of a blemish?

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When things like dead skin or cosmetic build-up get into your pores and plug them up, and that pore is still producing its normal amount of sebum, that's when it becomes a whitehead or blackhead. Whiteheads lie below the surface of your skin and blackheads are at the surface.

Both blackheads and whiteheads, says Dr. Chwalek, occur "when a pore gets blocked with dead skin cells and oils." The difference is that in the case of whiteheads the pore remains closed; whereas with blackheads, the pore is stretched open.

http://stylecaster.com/beauty/the-difference-between-blackheads-and-sebaceous-filaments/

http://www.instyle.com/beauty/skin/difference-between-blackheads-and-whiteheads-and-how-treat-them

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