Spots - Made of what exactly?

[Dr__Z]

OK random question, what is it that spots/blackheads are actually made from ???

[irisred]

Spots are, generally speaking, a build up of grease or sebum in the pores.  Generally sebum is a good thing but like in life, too much of a good thing and it all goes wrong! 

Whiteheads are caused by a bacterial infection of the blocked pore which makes it inflamed and full of pus, blackheads are just blocked pores, which is why the product of a blackhead is generally hard.  Euw!!!