Hard pimples on chin may be due to acne, folliculitis and other factors. 1. Acne: Mostly related to increased sebum secretion, blockage of follicular opening, Propionibacterium acnes infection, etc. It may manifest as hard pimples, i.e., nodules, and may also appear as pimples, pimples, seborrhea, and enlarged pores. 2. Folliculitis: most of the folliculitis is caused by bacterial and fungal infections, which is characterized by red papules around the hair follicles, and sometimes pus, itching, pain and other symptoms can occur. Patients should pay attention to facial cleanliness in daily life, avoid using cosmetics as much as possible; eat a light diet, avoid eating stimulating foods; avoid squeezing and scratching pimples, so as not to cause infection. Hard pimples on the chin may also be caused by other factors, it is recommended that patients seek timely medical attention to clarify the cause of the disease, targeted treatment.