40% urea cream: What it does and how to use it

What does 40% urea cream do?

Urea is part of the skin's natural moisturizing system and attracts water. In creams, its function changes with concentration: lower strengths mainly support hydration, while high strengths also act as keratolytics, meaning they help break down excess surface skin. That makes the amount of urea relevant to the job, not just a number on the packaging.1

Topical urea can improve dryness and scaling in several skin conditions. However, a benefit from urea in general does not mean every dry or itchy patch needs 40%. The useful distinction is whether you need mainly moisture or help removing a substantial buildup of skin.1

What is the difference between 20% and 40% urea cream?

Choose the strength for the job rather than the largest number on the tube, because skincare is not a high score competition. For ordinary dryness, a lower strength is the more relevant starting point; high strength urea is for a stronger skin softening and exfoliating effect.1

How do you use 40% urea cream?

1. 1Check the treatment area. Do not apply urea to broken, cracked, bleeding, infected or oozing skin, or areas with severe widespread redness.
2. 2Apply the cream externally, keeping it away from your eyes.
3. 3Use the amount and frequency on your particular product's label. Applying a keratolytic more heavily or more often than directed can leave skin raw and irritated.
4. 4If treatment leaves skin dry, apply a separate moisturizer afterwards. For keratosis pilaris, dermatologists recommend an ointment or an oil free cream.

Do not turn general moisturizing advice into instructions for repeated applications of 40% cream. For keratosis pilaris, moisturizer is used after bathing and whenever skin feels dry, at least two or three times daily; the exfoliating product still has its own directions.2

Can you use 40% urea cream all over your body?

Do not choose 40% as an automatic whole body moisturizer. Match the strength to the area and the reason for treatment. Urea is an option for keratosis pilaris, the tiny rough bumps often found on upper arms and thighs, but using urea for those bumps does not automatically mean using 40%.23

For keratosis pilaris, avoid scrubbing, which can worsen irritation. Apply a thick moisturizer to damp skin within five minutes of bathing. Treatment controls the bumps rather than curing them, so clearer skin can still need maintenance a few times weekly. If home treatment does not help, see a dermatologist rather than simply increasing the strength.2

What should you expect, and when should you stop?

The intended changes are softer skin and less dryness or scaling. There is no universal improvement timetable for every 40% cream and treatment area, so use the product's directions rather than assuming visible peeling must happen on a particular day.1

Urea can cause stinging, itching or a rash. If an exfoliating product leaves skin too dry or irritated, stop for a few days. Seek medical advice if symptoms persist or become bothersome. Urea also increases penetration of substances such as corticosteroids, so check with your prescriber before adding it over a prescribed steroid treatment.23

An unexplained rough patch on a hand or another area needs a dermatologist's assessment rather than automatic exfoliation. Some rough patches are actinic keratoses, which are precancerous growths that can develop into skin cancer.4

Is 40% urea cream available over the counter?

Many urea preparations are sold through pharmacies, but higher strengths and combinations containing medicines can require a prescription. Availability depends on the product and country; ask a local pharmacist specifically about 40% cream.3

Creams, lotions, gels and washes are different formats, not a requirement to build a matching bathroom set. Buy the form and strength intended for the condition being treated.3