If, with a wound, the skin surface has to be raised or deformed in some way, then you use Grimas Derma Wax.

First degrease and clean the skin you are going to be working on with Grimas Cleansing Lotion. Then wipe dry with a tissue.

DERMA WAX = Derma Wax
CLEANSING LOTION = Cleansing Lotion

Use the convex rounded side of the Derma Wax Spatula to take Derma Wax out of the jar. By scraping it out, you already make the texture a bit flexible.
You then make the wax easier to model by applying it to the ball of your thumb and scraping it off again with the spatula two or three times.
The wax must be flexible but also firm and must definitely not be allowed to get too soft and sticky.