What is the difference between whiteheads and blackheads?
A.When dead skin cells on the skin surface and inside the pore are not shed normally, they can join together and block up the pore. When combined with excess oil, it solidifies as a soft, white substance that plugs the pore. If the surface of the pore is covered by skin, it is called a whitehead (milia). If the pore is open, without any skin covering, the top of the plug is exposed to air and darkens, causing a blackhead. Whitehead becomes pimples when Propionibacterium acnes begin to grow inside the pores, causing irritation and inflammation.
