An increasing number of patients suffering from rosacea are self-medicating with a product that was designed for horses. And dermatologists want them to stop.

• The veterinary product uses the same active ingredient as an FDA-approved gel for rosacea treatment, but has never been tested on humans for safety or effectiveness.
• But the FDA-approved treatment is expensive.
• “Horse paste, by contrast, can be purchased from Amazon and vet supply stores for as little as $4, no prescription necessary,” Insider writes in an exposé of this whole weird thing.