Myositis ossificans is the following progressive disease: the muscles, tendons or ligaments gradually become calcified, due to the previous injury or bruising. This disease usually affects thigh and arm.
The exact cause is unknown, but this disease is usually due to severe contusion. Thigh contusion can cause deep tissue bleeding - this may make blood clot (hematoma) to form. Subsequently the blood clot can lead to calcification.
The common symptoms include: discomfort, pain, swelling, skin discoloration, skin bruising, joint stiffness, moving difficulty. The following methods can often reduce the pain and swelling: resting, ice packs, bandages, crutches, nonsteroidal anti-inflammatory medications, surgery.