Red and swollen pimples on the chin may be caused by folliculitis, acne, sebaceous cysts and other diseases. 1. Folliculitis: This disease is mainly caused by bacterial infections, such as Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus, etc. It is related to the existence of damage to the skin and hair follicles, and can be triggered by factors such as decreased immunity, obesity, frequent shaving, and so on, leading to red and swollen pimples on the chin of patients. 2. Acne: The causes of this disease include high androgen levels, exuberant secretion of sebaceous glands, inflammatory reactions, high temperature environment, high sugar diet, excessive psychological stress, staying up late, etc. It is commonly found on the face and chest. It occurs on the face, chest and other places, and is mainly characterized by pimples, papules and pustules, so the patient may have the condition of red and swollen pimples on the chin. 3. Sebaceous cysts: the basic cause of this disease is the hair follicle sebaceous gland mouth blockage, resulting in sebum accumulation into cysts, which then occurs in any sebaceous distribution of parts of the sebaceous glands, under normal circumstances cysts do not have uncomfortable symptoms, but if secondary bacterial infections, redness, swelling, pain and other symptoms, which can be manifested as a chin grows red and swollen pimples. When a red, swollen pimple grows on the chin, the patient can go to the hospital to clarify the specific cause.