Can you tell me if this could prevent minoxidil from working? Liquify the foam so you can apply it with a dropper. Fill the cap with foam. Hold the cap in a glass that’s filled with hot water. The foam will melt. Then apply with a dropper.
I do this because I get irritated by liquid Rogaine and I find that the foam doesn’t reach properly the scalp.
I haven’t heard of this being done before, but I’d think that this is a reasonable solution to your problem.