Tophi can be observed in patients with hyperuricemia and gout. Due to impaired purine metabolism leading to excessive uric acid production, urate crystals deposit as fine needle-like structures in soft tissues, causing chronic inflammation and foreign body reactions. This results in fibrous tissue proliferation and the formation of nodules.Tophi are most commonly found in the auricle, possibly due to the slightly acidic blood in this area. They can also appear in the first metatarsophalangeal joint of the toes, as well as in the fingers, wrists, elbows, and knees. In rare cases, they may develop in the nasal cartilage, tongue, vocal cords, eyelids, aorta, heart valves, and myocardium.Tophi near joints can invade bone tissue, leading to skeletal deformities or bone destruction.