This study looks at how well dotinurad works compared to allopurinol in lowering uric acid levels in adults with tophaceous gout. Tophaceous gout is a type of gout where lumps, called tophi, form in joints like hands or feet. Uric acid is a chemical in the blood that can cause these lumps if levels are too high.

• This study lasts 24 weeks, which is about six months.
• Participants must be between 18 and 75 years old and have gout for at least a year.
• There are specific rules about who can join, like not having kidney stones recently or allergies to certain medicines.

If you're a woman who can have children, you'll need to take pregnancy tests. People in the study must also agree to use birth control or not have sex to make sure there are no pregnancies during the study. If you have certain health issues like cancer, kidney stones, or allergies to the study drugs, you cannot join. The study aims to find better ways to treat gout, which can help people feel better and avoid painful tophi.