Whereas blackheads are open, whiteheads are closed comedones. They appear as small, white, round bumps on the skin’s surface. Whiteheads form when a clogged pore is trapped by a thin layer of skin leading to a buildup of pus. They range in size – from virtually invisible to large, noticeable blemishes – and can appear on the face or all over the body. Whiteheads are generally painless and non-inflammatory, so they don’t exhibit redness or swelling. Although they are unsightly, this type of pimple is generally considered a mild form acne.
Complementary therapies have been investigated for treating people with acne. Low-quality evidence suggests topical application of tea tree oil or bee venom may reduce the total number of skin lesions in those with acne. Tea tree oil is thought to be approximately as effective as benzoyl peroxide or salicylic acid, but has been associated with allergic contact dermatitis. Proposed mechanisms for tea tree oil's anti-acne effects include antibacterial action against C. acnes, and anti-inflammatory properties. Numerous other plant-derived therapies have been observed to have positive effects against acne (e.g., basil oil and oligosaccharides from seaweed); however, few studies have been performed, and most have been of lower methodological quality. There is a lack of high-quality evidence for the use of acupuncture, herbal medicine, or cupping therapy for acne.
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.