copy paste, 'Letrozole was used in a rodent study to effectively destroy (benign) breast tissue tumors (6), which may potentially indicate its use in males attempting to remove gynecomastia'..... however, far from conclusive that it'll work.
Take anabolic187 advice in regards to AI's, keep a clean diet and hopefully it's just water. There are some symptoms that you may have had before you noticed them such as sore nipples and inflamation.
BTW a DBOL only cycle is just, wrong! And for a number of reasons.