Hello and welcome to Healthcare Magic. Thanks for your query. A mild swelling and discomfort can be normally expected after a laser treatment, but a purulent swelling is indicative of an infection. Foban cream is an antiseptic cream which can be effective for mild superficial skin infections. If your swelling is prominent and bulging with pus, then you may need further treatment like draining the pus and oral antibiotics. It is difficult to make this assessment without a proper physical examination. So, I would advise you to review with your doctor for an assessment and planning further remedial measures. Best wishes, Dr. Sheeba Stephen