What is sarcoidosis? What are the conditions of sarcoidosis, what are the causes and can people recover without any treatment?

See below. Most of that is too much to answer here in 400 characters. However, about a 1/3 of patients with sarcoidosis go into remission and it resolves.
Sarcoidosis . Sarcoidosis is disease that causes inflammation of the lungs, kidneys and eyes. It is more common in patients of scandinavian or african america descent. It can cause episodes of acute & chronic lung & kidney disease & eye inflammation (uveitis)- treated with steroids & autoimmune medications. Most patients need treatment for complications that can cause significant damage when not treated.
Sarcoidosis . Sarcoidosis is an uncommon disease whose hallmark is the formation of tissue nodules known as granulomas. Ordinarily, granulomas form when the immune system is confronted with microorganisms that are very difficult to kill. White blood cells pile on the invaders and try to wall them off from the rest of the body. In sarcoidosis, the granulomas have nothing at their centers. Despite the resemblance to certain infections, sarcoidosis is not contagious, and no infectious agent has ever been proven to cause the disease. The cause of sarcoidosis remains unknown. Symptoms of sarcoidosis depend upon the extent and location of the granulomas. The lungs are the most common site for sarcoidosis, and may lead to cough, or shortness of breath. However, sarcoidosis is often found when a chest x-ray is done for an unrelated reason. Involvement of the skin, liver, and eye, and brain are not unusual, and may present as rashes, liver disease, eye inflammation, seizures, or mental changes. Heart and kidney failure can also occur. The disease can be very difficult to diagnose, as it can resemble many other medical conditions, including tuberculosis, leprosy, certain fungal infections, and multiple sclerosis. Sarcoidosis frequently stabilizes or disappears without any treatment, usually within 2-5 years. However, some people will have persistent or aggressive disease, and may require intense suppression of the immune system to prevent life-threatening complications.