Dear Mariettamom:I know of instances where two treatments were actually performed on the same day on the same area with good results, but given that this method has not been studied, we generally recommend that at least 4 weeks go by before the second treatment. You would want all post-treatment swelling (even subtle, subclinical swelling) to have resolved completely so that the largest possible number of fat cells can be taken up into the applicator. For any patient who might get optimal results with a single treatment, it is best to wait for the full four months before deciding if a second treatment will be necessary for an even better result.All the best,Dr. Clark