Sjogren's Syndrome Support Group
Sjogren's syndrome is an autoimmune disorder in which immune cells attack and destroy the exocrine glands that produce tears and saliva. It also associated with rheumatic disorders such as rheumatoid arthritis, and it is rheumatoid factor positive in 90 percent of cases.
I read your earlier post and sometimes the cracks in the corners of your mouth can be caused by vitamin deficiency or a condition called angular chelitis.(I'm not sure of the spelling).
Hope all this info gives you an idea of things that may help.