Whiteheads are not necessarily hormonal acne, but can be caused by closed pimples, folliculitis, pimple urticaria, etc. 1. Closed pimples: whiteheads can also be closed pimples, closed pimples, also known as whiteheads, usually mild acne, usually due to the body’s hormone levels of secretion of the body, most of the distribution of the forehead, cheeks, etc., and accompanied by seborrhoeic overflow and pore size. 2. Folliculitis: whiteheads of pimples may also be folliculitis, folliculitis is usually due to Staphylococcus aureus or other bacterial infections caused by purulent inflammation of the follicular opening, often manifested as red pimples on the skin, accompanied by pustules on the top, redness and so on. 3. papular urticaria: whitehead pimples may also be papular urticaria, usually due to mosquito bites caused by a series of allergic reactions, often manifested as a skin rash, and the top of the blisters. There may be other causes of whitehead pimples, it is recommended to go to the hospital in time to find out the cause, symptomatic treatment.