The main causes of acne in infants are increased androgen levels and infections. One possibility is that the mother’s androgen secretion increases during pregnancy, which passes through the placenta into the fetus, causing the sebaceous glands of the fetus to secrete excessively, leading to acne; another possibility is that the baby’s own androgen level increases, which also leads to sebaceous glands secreting excessively, thus leading to acne. Recent studies have found that infants can also develop acne when infected with Malassezia, a fungus that causes abnormal oil secretion that can lead to acne. There are other possible causes of acne in infants. It is recommended to consult a doctor for a complete examination to determine the cause of acne, and then give targeted treatment or therapy under the doctor’s guidance.