DR. FRAN E. COOK-BOLDEN, a dermatologist in Manhattan, is an advocate of skin-care minimalism. When a patient recently arrived for an appointment toting 20 different products she was using regularly — including an eye cream, a vitamin C cream, a wrinkle serum, a pigmentation cream, a mask, a peel, a scrub and “some sort of special oxygen detoxifying cream” — Dr. Cook-Bolden said she confiscated all but three.

“It gave me a headache just to look at all of those products,” Dr. Cook-Bolden said. “Just two products, a gentle cleanser and a good sunscreen, are enough daily skin care for most people, and you can buy those at a drugstore or a grocery store.”

Dr. Cook-Bolden is part of a back-to-basics movement among dermatologists. At a time when beauty companies are introducing an increasing number of products marketed for specific body parts —including necks, creases around the mouth and eyelids — or for apocryphal maladies like visible pores or cellulite, these doctors are putting their patients on cosmetics restriction diets.

They are prescribing simplified skin-care routines requiring at most three steps: soap; sunscreen every day, no matter the weather or the season; and, if necessary, a product tailored to specific skin needs, whether a cream for pimples or pigmented spots, or a vitamin-enriched moisturizer for aging skin. Each product, they say, can be bought at drugstores for $30 or less.