Acne patch is a common method used to treat acne. Normally, it needs to be applied continuously for 8-12 hours and then replaced, but the exact time needs to be determined according to individual circumstances. The acne patch can absorb excess oil secreted by sebaceous glands, which not only effectively blocks external dust and speeds up the recovery of acne, but also reduces the chance of acne infection. The time that the acne patch is used to suck out the pus from the hair follicle is normally around 12 hours, but when it is found that the acne patch starts to turn white after about 2 hours, it needs to be replaced once to prevent bacterial growth, so it is generally recommended that the acne patch be replaced after 8-12 hours of continuous use. Do not change them frequently to avoid damage and infection to the hair follicles. During the use of acne patches, pay attention to keep your face clean.