@MandyKatDWP It's recommended for all numbing creams to help the cream absorb deeper into the skin. They recommend an "air-tight, water-tight dressing", so cling film (aka plastic wrap) works perfectly.
It's actually listed in the instructions for lidocaine / prilocaine numbing creams.
#HairRemoval #LaserHairRemoval #electrolysis #NumbingCream
E.g.,
* https://www.emla.co.uk/how-to-apply/
* https://www.tattoonumbingcream.com/pages/directions-of-use