Oily skin typically has clogged pores. The sebum in clogged pores can oxidize when it is exposed to the air to from blackheads and blemishes.
Ordinarily, sebum is a naturally soft wax that is released from pores to form an invisible thin barrier of protection across the skin. But when skin is oily, it produces too much sebum, so there is a tendency for the sebum that normally would just slough off to clog up pores. In oily skin, pores that should be releasing sebum every day instead trap it inside.
Cosmetics makers would have you believe that if a little is good, a lot is better. But the fact is, overwashing is the enemy of oily skin. There are masks, toners, peels, sponges, brushes, and washcloths all designed to exfoliate oily skin. But remember:
And, finally, use exfoliating products that contain BHAs (beta-hydroxy acids) rather than AHAs (alpha-hydroxy acids). BHAs are soluble in oil, while AHAs are soluble in water. BHAs can dissolve the oil that clogs pores. AHAs just wash off oily skin. People with oily skin should exfoliate with BHAs like salicylic acid ratter than AHAs like citric, glycolic, lactic, malic, or tartaric acids.

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