As you would oil a squeaky hinge, oil an inflamed joint.

Warm coconut oil or mustard oil, mixed with camphor, should be massaged in case of stiff and aching joints. It will increase blood supply and reduce inflammation and stiffness on account of gentle warmth produced while massaging. Camphorated oil is an ancient rubefacient used for the purpose.

Ayurveda teaches that sesame oil is ideal when the inflammation is of long duration or the patient is obese. Avoid the application of  cool oils or cold conditions in the treatment of any person with arthritis.