Shoulder pain in people with diabetes is often due to stiffness of the joint, commonly called frozen shoulder, and the best management focuses on gradual improvement of movement and pain control; regular physiotherapy with guided stretching and strengthening exercises is the most important step, and you should do these exercises consistently at home as advised. Applying warm compresses, maintaining good posture, and using pain-relief medicines when needed can help, but controlling your blood sugar is equally important because high sugar levels can worsen stiffness and delay recovery. Avoid forcing movements or heavy lifting, and follow up with your doctor if pain is severe or not improving, as additional treatments like injections may sometimes be required.

Facial swelling with continuous pain and intermittent fever for 20 days is not normal and most likely suggests a serious infection, such as a dental abscess or deep skin infection like Cellulitis, especially since it is worsening and not responding to painkillers. This requires urgent medical attention. You should see a doctor or dentist as soon as possible, as treatment may need antibiotics, drainage of any pus, and treatment of the underlying cause (such as a tooth problem). Do not rely only on painkillers, as they only mask symptoms and allow the infection to spread. Seek immediate care if swelling spreads rapidly, you develop a high fever, difficulty opening the mouth, swallowing, or breathing, as these can be signs of a serious complication.