Smear
on latex
Smear on a generous layer of liquid latex with a cotton swab in the
desired shape and size of your wound. Three to four inches will look
realistic.
Go to any Halloween or party supply store
to find liquid latex.
Create
the gash
Use a toothpick to score a line in the center of the latex, which will
become the bleeding gash. Let it dry for a few minutes, and then use
a toothpick to open up the gash even more, creating a jagged, uneven
line and curled-up edges.
Blend
in bruising
Use a cotton swab dipped in a tiny drop of purple paint and dab it around
the outer edges of the wound to create a bruised look.
Create
scrapes
Dip another cotton swab in the red and brown paint and dab around the
opening of the gash. That will create the look of scraped skin.
Mix
and apply blood
Mix the fake blood by combining the corn syrup, red and blue food coloring,
and dish soap. Use a toothpick to apply a thin layer of blood to the
gash
You can also use ready-made fake blood gel.
Get
gory
Go over the gash again with a blood-dipped cotton swab that is saturated
to fill the gash completely and create oozing gore.
Smear
on latex
Create
the gash 
Blend
in bruising
Create
scrapes
Mix
and apply blood
Get
gory
