I have successfully used Digestive Blend and the steam cup method to battle sinus infections in myself and my kids. For myself I put 3-4 drops of Digestive Blend around my belly button (rub it in) 4 times a day. Usually by the 4th or 5th day the sinus infection is gone. Another method I use with sinus infections is a steam cup. Heat water in a mug until steaming and add one drop each oregano, lemon, peppermint, and melaleuca. Close your eyes and breathe the vapors in your nose and up into your sinus cavities. This is too intense for my little sons so I put one drop of each of the 4 oils into the back corner of the bathtub. I put my kiddo into the tub, turn on the shower (not tub!), close the bathroom door, and allow the room to fill with steam. You create the same effect as a steam cup, it’s just less intense. One new thing I learned lately was to apply Melissa on the sinuses of the forehead. I haven’t done this yet so I don’t have experience with it working but definitely use the other two methods mentioned above quite often!