My GF has rashes on the back which appears and disappearing leaving a brown scar. Also there is extreme amount of hair loss. can someone suggest how to diagnose it ? There are popping noises from the joints which hints they are becoming weak as well. All the tests are negative and do not know what should we take. can someone please suggests the test we need to take to diagnose pls.. One thing i am sure of is, its transmitted through saliva and i am also having same kind of hair loss and joint pain as well. Kindly help to diagnose it..