There are small collections of inflammatory cells (granulomas) anywhere in the body, most commonly in the lungs and in the lymph nodes, it can also affect the eyes, skin, heart, and other organs. The cause of sarcoidosis is unknown, but it is believed to be caused by the response of the body's immune system to an unknown substance. Also, infectious agents, chemicals, dust, and a possible abnormal reaction to the body's own proteins (self-proteins) could be responsible. It can affect the eyes: a) blurred vision b) eye pain c) burning, itching or dry eyes d) severe irritation e) sensitivity to light.

Treatment: There is no cure, but in most cases, it goes away on its own. If the symptoms are severe: a) Corticosteroids: powerful anti-inflammatories, through a cream on the lesion or through drops in the eyes. b) Immune system inhibitors: such as methotrexate (Trexall) and azathioprine (Azasan, Imuran), reduce inflammation by suppressing the immune system. c) Hydroxychloroquine (Plaquenil) for skin lesions and for high levels of calcium in the blood. d) Inhibitors of tumor necrosis factor alpha, treats inflammation associated with rheumatoid arthritis.