Diagnosed Sept 1/17 with the right side of my face and top scalp involvement. Yesterday, I put a Sistane Ultra drop in my right eye expecting cool soothing. Suddenly I felt as if someone held a blowtorch to my eye and scalp. I ran to the bathroom and turned the hand-held cold shower on my face and scalp. The intense pain brought me to tears. After a few seconds of flushing the pain eased and was gone. There was definitely a connection between my right tear duct, right nostril and upper scalp. Now I am afraid to put anything in my right eye out of fear this odd interaction would happen again. Never had pain like this, and I gave birth without pain killers.