Salt rheum is a medical condition that refers to a skin disorder that causes inflammation, itching, and discharge of watery fluid. Unfortunately, there are no direct antonyms for the term "salt rheum." However, a few words come to mind that are associated with skin conditions that are the opposite of salt rheum. For instance, the words smooth, hydrated, clear, and healthy come to mind. These words represent the opposite of skin conditions that are inflamed, dry, itchy, and infected, which are typically associated with salt rheum. Therefore, the best way to counter salt rheum is to maintain good skin health, such as staying hydrated, reducing stress, avoiding allergies, and seeking medical attention when necessary.