Techniques
Echography
It is well known that as higher the ultrasound frequency is, the better the resolution and smallest superficial tissue structures visualization and measurements. To diagnose skin changes you need probes from 22 to 100 MHz, which allow you to evaluate the entire skin thickness and for epidermis and dermis sighting examination. The most optimal frequencies in this practice are 33-75 MHz.
Raman spectrometry
TODO