Retinol is safe to use on all skin types; however, Dr. Henry encourages you use it differently if you have dark skin. "People with darker complexions should be more careful and move slowly with retinol," she said. "If you overuse it, you can experience retinoid dermatitis, which is a rash that can become hyperpigmented in darker skin." If you have severe cystic acne, consult your dermatologist before trying out retinol.