Birth Control Patch works on the foundation of hormones. Basically it has two female hormones estrogen and progesterone, which prevents ovulation. It does not permit the eggs to developing from your ovaries. So, if there is no egg, what sperm will fertilize, knowning that prevents pregnancy. It also thickens the cervical mucus in order that the sperm cannot achieve the eggs. Testosterone Rheumatologists have a special interest in unexplained rashes, fever, arthritis, anemia, weakness, weight loss, fatigue, joint or muscle pain, autoimmune diseases and anorexia. They often act as consultants, acting as medical detectives at the request of other doctors. Psoriatic arthritis, an inflammatory joint disease that affects psoriatic patients.