Urea can be useful in a seborrheic-dermatitis routine when dryness or stubborn scale is part of the problem. It helps skin hold water and, at suitable concentrations, can soften thick or flaky outer skin. Direct scalp studies tested urea together with lactic acid and propylene glycol, so they support the combination product rather than proving what urea does by itself.

The right product matters. A moisturiser with urea and a stronger scale-softening scalp treatment can feel very different, and already-cracked or inflamed skin may sting. Mild smarting or burning was reported in the combination studies, although the researchers could not assign that effect to urea alone. Start with the directions on the exact product and stop if irritation persists.