All skin types produce oil, but some produce an excess that makes them more prone to developing blackheads, whether due to their own sebum production or exposure to external agents such as environmental pollution.
More than just an excess of sebum produced by the skin, blackheads arise when this sebum comes into contact with air, oxidizing and acquiring that characteristic dark tone.
The appearance of blackheads and enlarged pores has various causes, including genetic predisposition, hormonal imbalances, and the natural process of skin aging. However, the most common reason behind the dilation of pores is the accumulation of dirt and impurities.