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.lupus.org/resources/15-questions-oral-issues-with-lupus
Read the section entitled "Digestive System" in the following:
http://www.healthline.com/health/lupus/effects-on-body
Mouth sores are addressed under the "Symptoms" section:
https://www.rheumatology.org/practice/clinical/patients/diseases_and_conditions/lupus.asp