I apply both moisturizing cream and a medicinal ointment/lotion on some recovering injuries. The skin is unbroken, and the medicinal lotion is primarily for the entry point of a titanium rod in my previously broken leg.
Since I want the ointment to penetrate more deeply, which do I apply first?
Logical answer 1: Ointment first, as the lotion will displace it from the uppermost layers, "pushing" it deeper down.
Logical answer 2: Lotion first, since it will occupy the space in the upper layers, allowing the ointment to more easily bypass them.
What does the medical science say?