It sounds you doctor
found a rash, and wants to make sure that it is not a manifestation of something else. If the rash is a Graves disease rash, then it usually means you have Graves disease. Graves disease is the most common type of hyperthyroidism. This is where your thyroid gland is secreting too much thyroid hormone. Symptoms include being hot all the time, not sleeping well, weight loss
, sweating, fast heart rate, and exophthalmos, a phenomenon where the eyes protrude outward. A rash (typically seen on the legs) can also be seen. A simple blood test looking for TSH followed by a test for anti-TSH receptor antibodies diagnoses Graves disease. Graves disease is very treatable or curable, depending on the preference of treatment. There are a couple medications that will work to reduce thyroid hormone. Most patients opt to get their thyroid gland ablated with a special type of iodine. This is a permanent fix and patients replace thyroid hormone with the medicine synthroid. I suggest you schedule an appointment with your doctor and ask to get your TSH tested so that you'll know for sure whether you have Grave's disease or at least another cause of hyperthyroidism. From there you can discuss the multiple temporary and permanent modes of treatment. Good luck.