Several known ways to diagnose leprosy properly exist. The physician will need to take several physical tests trying to detect the hidden symptoms ASAP. Be ready to give away a tiny sample of skin. Wait for the lab results and conclusion. A lepromin exam is another popular method to identify this disease. This is a bit riskier as the procedure requires injecting some number of leprosy-causing bacteria into the body. This examination usually takes place in the region of upper limbs. If you get irritated at the injection site, it might be the clue.