What's Going On: You might be all too familiar with these, which tend to make their debut when you’re in high school. "Blackheads, like whiteheads, are blocked pores," says Zeichner. What gives them their namesake color, though, is the oil. It's already dark, but blackheads also have a larger opening at the surface than whiteheads do, meaning air can enter and oxidize that oil sitting inside the pore, turning it even darker.
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A major mechanism of acne-related skin inflammation is mediated by P. acnes's ability to bind and activate a class of immune system receptors known as toll-like receptors (TLRs), especially TLR2 and TLR4.[44][64][65] Activation of TLR2 and TLR4 by P. acnes leads to increased secretion of IL-1α, IL-8, and TNF-α.[44] Release of these inflammatory signals attracts various immune cells to the hair follicle including neutrophils, macrophages, and Th1 cells.[44] IL-1α stimulates increased skin cell activity and reproduction, which in turn fuels comedo development.[44] Furthermore, sebaceous gland cells produce more antimicrobial peptides, such as HBD1 and HBD2, in response to binding of TLR2 and TLR4.[44]
Alpha-Hydroxy Acids – These are synthetic acids derived from sugary fruits that remove dead skin cells3 while reducing inflammation. The two common types that can be found in over-the-counter acne treatments are glycolic acid and lactic acid. Another benefit of these acids is that they improve the appearance of your acne scars and make your pores look smaller by stimulating the growth of new, healthy skin.

Home remedies – Let’s not forget home remedy treatments for acne – of which there are plenty. For instance, many people have tried lemon juice, an excellent antioxidant, thanks to its vitamin C. Some use baking soda paste, which kills bacteria and absorbs oil, while others use an oatmeal face mask, because oatmeal also absorbs excess oils from your skin. Other DIY treatments include a honey and cinnamon facial mask, green tea, and steam therapy.
Many doctors treat whiteheads, blackheads, or pimples, with either a prescription for an antibiotic or prescription strength benzoyl peroxide or both. These treatments are harsh for mild to moderate problems. If you have an exceptionally deep skin infection causing nodules or cysts, you should be given a referral to a dermatologist. This is also true if you have an aggressive form of acne that causes blemishes to grow together all over your upper body (acne conglobata). You will probably need laser therapy or surgical reconstruction procedures if you have this rare condition.

If a pore is open, it’s called a blackhead or “open comedo”. Because of the opening, contact with the air oxidizes the dead skin cells inside the pore. The air contact turns the melanin inside them darker in color, similar to the way a peeled banana left exposed to the air will darken. This is how the blackhead forms. The color of a blackhead is not because of dirt. It’s a mixture of air and the skin pigment called melanin.

Scars (permanent): People who get acne cysts and nodules often see scars when the acne clears. You can prevent these scars. Be sure to see a dermatologist for treatment if you get acne early — between 8 and 12 years old. If someone in your family had acne cysts and nodules, you also should see a dermatologist if you get acne. Treating acne before cysts and nodules appear can prevent scars.