Many medical creams and ointments come with instructions like “apply a thin layer.” This isn’t random wording. The amount and way you apply them affects both how well they work and the risk of side effects.
Strong steroid creams, for example, should usually be spread gently in a very thin film over the affected area. Rubbing hard or using huge quantities doesn’t make them work faster. Instead, it increases absorption into the body and can lead to thinning of the skin over time.
The “fingertip unit” method is often used: the amount of cream squeezed from the tip of an adult finger to the first crease roughly covers a small area of skin. Doctors may explain how many fingertip units to use for different body parts.
Gently smoothing the cream until it just disappears is usually enough. For some barrier creams or moisturisers, a slightly thicker layer is fine, but heavy massage is still not needed unless specifically advised.
If you’re unsure how much to use, ask your doctor or pharmacist to show you. Correct application saves product, money and your skin.