My mom got Stevens Johnsons syndrome - it affected her eyes causing infections and corneal scarring.
She also had Pemphigus Vulgaris - they are very similar.
Both are autoimmune conditions.

Just wanted to mention them , just in case.

stevens johnsons
http://www.google.com/search?hl=en&q...=Google+Search

pemphigus vulgaris
http://www.google.com/search?hl=en&s...lgaris&spell=1