Either health care costs or something related like compensation to doctors would make a lot of sense, I think the latter is less likely though but we don't have the justifications between "red" and "yellow" - and it could clearly trend down from there in raw terms.
Though Cuba is known for having wide access to healthcare and measures well in "preventative" terms as well as general public health, so that comparison to the USA isn't perfect but in pure cost that still might be it.
I'd also note it's not quite just Cuba but appears to be a couple other places in the Caribbean that are red, but this just doesn't look like a map for production or consumption of some good, and I can't really explain what others have pointed out like in South America with another idea.