Problem is, you cannot rub any medicine or potion of any kind “down into the follicle.” The first laser to hit the market was “Thermolase” and they would wax the hair out, and rub in a lotion containing [black] carbon. The technique was a total failure (nice idea though) because the cream could NOT be rubbed into the evacuated follicle. Impossible!
I think I mentioned the work by Jules (Julius) Shapiro …perhaps his work is online. Bottom line … it didn’t work. PDT works nicely for diseases of the skin that are in the upper layers and when the diseased tissue absorbs the chemical … A form of this exists called, I believe, “blue light therapy” for pre-cancers. However, it’s still not as good as the “old fashioned” Fluorouracil.
Check it out: ThermoLase – HairFacts | Hair Removal Information