Acne pits are a type of scarring left on the surface of the skin after acne and other lesions have faded, and are primarily a repair response by the body to damage to skin tissue. It is common in cases of severe skin damage caused by acne, and can also be related to risk factors such as gender, genetics, and acne severity. 1. Basic etiology: Acne is a chronic inflammatory disease of the sebaceous glandular unit of the hair follicle. Causative factors include excessive sebum secretion secondary to androgen stimulation, abnormal keratinization of the hair follicle due to follicular plugging, propagation of Propionibacterium acnes, and inflammatory reactions. Acne scarring is the body’s repair response to tissue damage. When inflammatory damage from acne reaches deep into the dermis or a large epidermal defect, it can lead to scarring as the epidermis cannot regenerate in that area. 2. Risk factors: According to research, the incidence of acne scarring in male patients is generally greater than that in female patients; secondly, the incidence of acne scarring in the family will also increase; the higher the severity of acne, the greater the likelihood of scarring. Once acne pits appear, you need to go to the hospital in time, under the guidance of the doctor for reasonable treatment.