Sebum: There are glands in the skin that release an oil substance called sebum. If your pores get clogged the sebum builds and thats wha you are noticing. The buildup of sebum coming from a pore that you are applying pressure to. It looks like a thin white string. Facial cleansing and exfoliating will be a good start. If you over counter skin scrubs can help
Answered 5/17/2018
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