What is blemish-prone skin and acne? Blemish-prone skin is skin that has a propensity to develop comedones and pimples. It is often oily and appears shiny. This is because the sebaceous glands produce more sebum than in other skin types. This treatment includes 3 masque applications, sterilization and DEEP cleaning extraction which helps to renew dead skin cells, reduce sebum, soothe down blemishes (redness), repair and strengthen the skin cells.