Step 1: Gather Up!
First, gather some pva (skin friendly/kids) glue, golden syrup, tissue paper (pref white) blue and red food colouring and some flour.
Step 2: On It Goes!
Then put a layer of glue over the area you want the scar, let it dry a bit, but it still needs to be sticky!
Step 3: Tissue Paper...
After, stick on tissue paper and glue the edges down! Add lumps and bumps for an extra realistic look!
Step 4: Mix 'em Up!
Now you add the blood. If you've already got fake blood don't worry, but if you don't:
Put 7 drops of red food colouring and 4 drops if blue food colouring in with 1tbs of golden syrup and 1tbs of any kind of flour!
Step 5: Apply!
Now the fun bit! Put your fake blood on the "scar" and smere all over, covering the tissue paper!
Step 6: Taking Off
To get your scar off of your arm, either peel it off (if your brave) or soak your arm in warm water and it will peel of!