Urea or lactic acid for keratosis pilaris?

What is the difference?

If dryness or itch is your main concern, either ingredient in a creamy moisturizer is a sensible starting point. If you want a specific strength tested for reducing bumps, consider 10% lactic acid. That does not make urea the weaker choice: the lactic acid comparison was against salicylic acid, not urea. A cream's directions matter more than whether the packaging has promoted it to a 'resurfacing system'.13

How should you use it?

1. 1Wash with mild, unperfumed bathing products and cool or lukewarm water. Avoid hot showers and harsh scrubs, which can make KP worse.
2. 2Apply your moisturizer within five minutes of bathing, while the skin is still damp. Gently massage it into the affected areas.
3. 3Keep moisturizing regularly. General KP care includes moisturizing at least two or three times daily, but follow the specific directions for an exfoliating cream rather than increasing its use automatically.
4. 4Use an exfoliating treatment only in the amount and frequency directed. If it makes your skin dry or irritated, stop for a few days.

How long until the bumps improve?

In a trial involving 50 people, 10% lactic acid cream applied twice daily reduced the number of bumps by an average of 66% after 12 weeks. Improvement was already visible at four weeks, with the fastest reduction during that first month. Mild irritation occurred. Use those timings to set a realistic review point, not the percentage as a promised result for your cream.3

Improvement can take months, and bumps are likely to return when treatment stops. Treatment controls KP rather than curing it, so 'finished the bottle' is not the same as 'finished the job'. Once the bumps are controlled, a dermatologist can adjust maintenance to less frequent treatment or a nonprescription moisturizing cream.14

What if your skin is sensitive or mainly red?

KP is more common in people with very dry skin or eczema. Do not keep applying an irritating exfoliating cream in pursuit of faster smoothing. For the red facial variant, creams containing urea or lactic acid can diminish scale, while persistent redness needs a separate treatment discussion. Smoother texture and less redness are different goals.147

Speak to a pharmacist if your skin becomes itchy or inflamed, or shop bought creams are not helping. If you are following a dermatologist's plan and see no improvement after four to six weeks, tell them. Bumps that remain bothersome despite lotions are also a reason to contact your healthcare provider.146