👉 Tarsitis is a viral infection that affects the skin and soft tissues of the body. It can cause inflammation, tenderness, swelling, and pain in the lower back, buttocks, shoulders, hips, knees, ankles, wrists, elbows, and hands. Symptoms may include fever, chills, fatigue, muscle or joint pain, headache, sore throat, cough, difficulty breathing, loss of appetite, nausea, vomiting, and redness or warmth at the site of infection. Treatment options