- Many factors contribute to pore distortion, among which a genetic predisposition making pores more visible to the eye, as well as prone to clogging. Excessive sebum is another significant cause. Gender, age or a hormonal imbalance can also play a part. Stress, tobacco and pollution all influence the state of your pores. At Bioderma, we put the best ingredients into Sebium Pore Refiner. A powerful astringent, agaric acid helps to visibly minimize the appearance of pores, hence seems to refine skin texture. Silica powder and anti-reflection particules ensure a powdery and mattifying effect. Salicylic acid exfoliates to enhance radiance. The exclusive Fluidactiv® complex helps to visibly minimize the look of pores.