Lupus Support Group
Lupus is an auto-immune disease in which the immune system cannot distinguish between threats (like viruses and bacteria), and healthy cells and tissue. As a result, the body produces antibodies that inflict cell damage, most commonly targeting joints, skin, kidneys and the nervous system. Join the group and find support for coping with lupus.
http://www.rightdiagnosis.com/symptoms/purple_tongue/causes.htm
http://umm.edu/health/medical/ency/articles/tongue-problems
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0003538/
http://www.dailymail.co.uk/health/article-37340/How-colour-tongue-reveals-health.html
http://www.healthhype.com/tongue-discoloration-white-red-purple-blue-yellow-black.html