Whiteheads are primarily caused by the clogging of hair follicles with oil (sebum), dead skin cells, and bacteria. Several factors can contribute to this clogging, including hormonal changes (such as during puberty, menstruation, or pregnancy), genetic predisposition, and certain medications. Excessive oil production and improper skincare routines can exacerbate the condition. Additionally, environmental factors like humidity and pollution can also play a role in the formation of whiteheads. Identifying these causes is essential for effective prevention and management of whiteheads.