Acne refers to “pimples” and is related to changes in hormone levels in the body and increased production of sebaceous glands. Drinking the right amount of milk does not usually cause acne; when too much milk is consumed, it may cause acne to occur or worsen. 1. Milk contains high levels of soy protein and whey protein, which can lead to an increase in insulin-like growth factor (IGF) in the body. IGF promotes increased secretion of sebaceous glands, which secretes more sebum, which clogs up the mouths of the hair follicles and leads to the development of acne. 2. Milk contains more growth-promoting hormone, which can promote sebaceous glands to secrete more sebum and trigger or aggravate acne. 3. Milk contains more carbohydrates, which can lead to increased secretion of insulin growth factor in the body and promote the sebaceous glands to secrete more sebum. Therefore, drinking a moderate amount of milk will not cause acne; drinking too much milk may lead to increased secretion of sebaceous glands and the development of acne. It is recommended that acne be treated in a timely manner and in accordance with medical advice.