Is that person winking at me?

If it seems like someone is winking at you, a) they might be, it’s Valentine’s week, or, b) they may have a condition known as blepharospasm, which is a symptom of MCAS. My right eye started doing this 10-15 years ago, long before I knew anything about MCAS.

(Turns out there are ~5,000 mast cells per cubic mm of conjunctival tissue, i.e., the inside of the eyelids.)

Photo D8