The milk-drop method
Add a few drops of your own breast milk into the cup before placing it. This supports the skin's natural processes and — more importantly — ensures full contact between silver and skin, which is how the cups provide their benefit.
Creams, lotions, and balms create a layer between the silver and your skin, blocking the direct contact that makes the cups effective. If your healthcare provider has prescribed a topical treatment, ask about alternating timing.