Whiteheads are a type of acne that form when dead skin cells, bacteria, and skin oil clog a hair follicle. They can be caused by a variety of factors, including hormones, genetics, and certain medications. To prevent whiteheads, it is important to keep skin clean and moisturized, avoid touching the face, and use oil-free makeup and skin care products. It is also important to avoid squeezing or picking at whiteheads, as this can cause inflammation and lead to scarring. Following a consistent skin care routine and avoiding potential triggers is the best way to prevent whiteheads.