Hi Dear, Welcome to HCM. Understanding your concern. As per your query you have pain and inflammation on the shin , which can occur due to hematoma , infection , ellergic reaction or psoriatic arthritis. Well psoriatic arthritis occurs when your body s immune system begins to attack healthy cells and tissue. The abnormal immune response causes inflammation in your joints as well as overproduction of skin cells. I would suggest you to consult orthopedic surgeon for proper examination. Doctor may order x-ray , MRI , test for rheumatoid factor or joint fluid test . Doctor may prescribe anti rheumatic drugs like methotrexate , immunosuppressants , TNF-alpha inhibitors , steroid injections and in some severe cases joint replacement surgery . For now control your weight , do light exercises and apply cold compresses . Get Well Soon. Best Wishes, Dr. Harry Maheshwari