Since the medication is highly potent, only a little is needed to be effective. Please follow the instructions you have received directly from your dermatologist regarding how much to use and and how to apply it.
You can either apply the solution directly to the affected area and then massage in or to spread the medication further, you can first rub in your fingers and then massage it into a larger area. If you are considering increasing the amount, please first consult with your assigned dermatologist for 1:1 advice.