Paraffin wax is a heat therapy. It helps to increase blood flow and relax the muscles, which can help relieve pain caused by arthritis, osteoarthritis and fibromyalgia. Paraffin wax may help to soften hardened skin. It increases the skin's elasticity, allowing for increased movement and mobility, especially on the skin covering the hands. It is often used for muscle, tendon and ligament pain. With conditions like arthritis it may increase blood flow, improve joint stiffness and reduce pain. It may also be used to treat bursitis, tendonitis, sprains and pulled muscles