Sweat duct tumors that bulge after the laser scabs fall off may be caused by factors such as incomplete removal and scarring. 1. Incomplete removal: Sweat duct tumor, also called sweat duct cystic tumor, is a kind of benign skin tumor involving sweat gland ducts, usually occurring on the face. After laser treatment, the scabs come off and there are localized bumps, which may be related to the incomplete treatment, for example, the sweat duct tumor is larger in size, the laser treatment is incomplete, and the new sweat duct tumor recurs. 2. Scar proliferation: after the laser treatment of sweat duct tumor, if there are infections, bleeding and other conditions during the recovery process and without scientific standardized care, it may lead to delayed healing of the treated area, so there is a possibility of stimulating scar proliferation and forming a raised appearance. If the localized bulge is caused by incomplete treatment, it is recommended to have another treatment if it is caused by scar proliferation. If it is caused by scar proliferation, it is recommended to combine with the doctor’s advice to give treatment. All of the above cases need to go to the regular medical institutions to avoid adverse consequences.