What causes blemishes to develop in oily skin?

Blemishes in oily skin primarily develop due to clogged pores, which occur when excess oil combines with dead skin cells. This mixture can block hair follicles, leading to the formation of pimples, blackheads, and other forms of acne. Oily skin naturally produces more sebum, the oil that protects and moisturizes the skin. However, if the pores are not cleared regularly, the excess oil can trap dead skin cells, creating an environment conducive to bacterial growth and inflammation. This is a key reason why individuals with oily skin are more prone to breakouts and blemishes.

The other options do touch on relevant skin care issues, but they do not directly address the primary cause of blemishes associated with oily skin as accurately as clogged pores do. For example, while excess moisture might contribute to other skin issues, it is the clogging from oil and dead skin that predominantly leads to blemishes in oily skin specifically.