Cynthia Nixon, who played glamorous Miranda Hobbs on Sex and the City, appeared at the W South Beach last week to talk about something not glamorous at all: rosacea. The famous redheaded Emmy winner, 46, revealed she has the inflammatory skin condition that affects more than 16 million Americans. It’s characterized by blotches, bumps and eye irritation.

What has been your experience with rosacea?

I went for years without knowing what was going on with my skin — thinking that it was just acne — before I finally went to the dermatologist in 2007 for a skin screening. What are some of the biggest misconceptions out there?

I know that in my case, I thought that I just had to deal with my skin problems and that nothing would help. Because rosacea looks similar to acne, many people try to self-treat with over-the-counter products, but these actually can make rosacea worse. Because it’s unpredictable and can be exacerbated by things like stress, alcohol and sun exposure, [sufferers] may be perceived to be really embarrassed, shy or even having had too much to drink.

Sun is the No. 1 trigger for rosacea. Should we be worried living in Miami?

Sunshine and heat are some of the biggest triggers of rosacea and impossible to avoid if you live here. I wear SPF 30 every day.

Any easy makeup fixes?

My skin is sensitive, which is common for people with rosacea, and fragrance-free and oil-free makeup is less irritating for me. I’m not a huge makeup person, but I stay away from anything with lots of shimmer. The minerals that give the product the shimmer are irregularly shaped and rough-textured.

Did you see “The Carrie Diaries,” the prequel to “SATC?”

I haven’t seen it. Believe it or not, I actually don’t have a TV!

What is your latest news?

I’ll be in a new Neil LaBute play called The Money Shot, which will debut on Broadway in the fall.

Madeleine Marr

See Nixon’s PSA at www.rosaceafacts.com