Detailed answer

Blackheads develop when pores on the skin become clogged with excess oil, dead skin cells, and bacteria. While using expired skincare products can have negative effects on the skin, such as irritation or allergic reactions, they do not directly cause blackheads. Blackheads are primarily caused by factors like excessive oil production, hormonal changes, and poor skincare habits, such as inadequate cleansing or using heavy, pore-clogging products. To prevent blackheads, it is important to maintain a consistent cleansing routine, incorporate exfoliation to remove dead skin cells, and choose non-comedogenic products that do not clog the pores.