Many skin conditions, such as pimples, whiteheads, and blackheads, result from clogged pores. Pores, which are the areas above hair follicles, are openings in the skin that can become clogged with sebum (a necessary skin oil), dirt, and dead skin. The larger these openings are, the more likely substances will seep into pores and clog them. When pores get clogged, unsightly skin conditions often arise.