Summer is upon us, and with it the summons to achieve the perfect tan. While many choose self-tanners to get a golden look sans sun exposure, an expert warns that there are actually some hidden dangers in a faux glow — if you misuse them. “Self-tanners shouldn’t be mistaken for sun protection,” dermatologist Dr. Dawn Queen told The Post. And there’s a key mistake to avoid after you spray or slather some on. Dihydroxyacetone (DHA) is the active ingredient in most self-tanners. It works by