Keratosis pilaris is a common, harmless condition that causes small, hard bumps on your skin. You can't prevent it. Keeping your skin moist helps lessen its effects.
You also helps if you:
Don't scratch at the bumps or rub your skin roughly.
Use warm water rather than hot for bathing and showering.
Limit your time in the water.
Use soap that has added oil or fat.
Use thick moisturizers generously on the skin.
Add moisture to the air in your home with a humidifier.