Starch iodine and paper tests are two such tests. An iodine solution is applied to the sweaty areas in the starch iodine test. After drying, the focal points of sweat turn dark blue when starch is sprinkled on them. Similarly, special paper is placed over the sweat points in a paper test and then weighed to determine the intensity of sweat accumulation. QSART ( Quantitative Pseudotumor Axon Reflex Test) is another test used to measure the nerves that control sweating by using mild electrical stimulation on the skin. Sometimes imaging tests like x-rays and CT scans may also be required to rule out cancerous conditions causing excessive sweating.