The bump left by the acne under the nose may generally be an inflammatory reaction formed by the inflammatory response to the acne, which may lead to a limited hyperplasia. This hyperplasia will also gradually subside if the inflammation of the acne subsides, generally some subside may be 2-4 weeks, some if it does not subside, you can use medication to help subside. If the redness is more obvious, you can use anti-inflammatory creams to help subside, you can choose Adapalene gel, Clindamycin gel. Also if the bump is accompanied by hard knots and lumps, you can also use mucopolysaccharide polysulfate cream, sodium heparin allantoin cream, which has the effect of softening and dispersing the knots and can repair the scar tissue of the epidermis.