This Chest wound wound is created to simulate a lung puncture.
Add blood and a little aqua seltzer salt to the wound to make it bubble up.
Blood or bruising can be added with eyeshadow powder.
After use the wound/ scars can be rinsed under the hot tap , dried and stored. The stick-on back will keep sticking for several uses.
If more permanent adherence is needed you can add some FX glue gel. This glue can be washed off with hot water, leaving the model undamaged.