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Dip the end of a paintbrush into the liquid latex and paint it onto your actor's skin. Apply the latex in a shape that looks like a natural wound so it doesn't appear fake on camera. Spread the latex thin enough over the surface so you can barely see the skin underneath it. You can buy liquid latex at costume stores or online. If you or someone on your film has a latex allergy, you can use white school glue instead though it may not hold as well. Lay a piece of toilet paper over the surface of the liquid latex. Press the toilet paper so it's flat against the skin without any bubbles or deformation. Once the toilet paper is applied, carefully tear the edges of the toilet paper by hand so it matches the shape of the latex you applied. You can also use tissues if you don't have any toilet paper. Dip your paintbrush back in the liquid latex and paint around the edges of the paper you applied so they don't lift off of the skin. Then carefully paint over the surface of the toilet paper so the wound looks shiny and fresh. Let the latex dry completely, which should only take about 5-10 minutes. Use a hair dryer if you want to make the liquid latex dry faster. Once the latex is dry, use your fingernail or pin to tear through the center of the toilet paper. Pull the edges of the tear to the side to bunch the toilet paper up to make your wound look like it's deep and sticking out of the skin. Keep working with the edges of the tear until you're happy with the shape. Be careful not to accidentally stab the person you're applying the wound to if you're using a pin or sharp object to tear the paper. If you don't know what you want your wound to look like, then look up images from other horror movies or actual wounds to get ideas for reference. Follow the mixing directions on a package of gelatin and stir it until it has a syrupy consistency. Use a brush or a butter knife to apply the gelatin in thick lumps around the fake wound. Stretch the gelatin and move it around randomly to shape it. The gelatin will quickly set and dry in place. Test the temperature of the gelatin on your hand before applying it since it could be hot when you mix it. When you're applying wounds, crush up some oatmeal or corn flakes and attach them with liquid latex. Let the latex dry completely before painting over the oatmeal to make it look like a wound. The oatmeal or corn flakes will give the wound a bumpier texture and make it seem more realistic. Use a powder or cream foundation that matches the skin tone of your actor and apply it over the entire wound as a base coat. Make sure none of the toilet paper shows through the foundation or your wound will look fake. Blend the edges of the wound into the skin with a blending sponge so it looks realistic. A foundation airbrush will give your fake wound the smoothest application, but any applicator will work for painting your wound. Use a makeup brush to add in different shades of blue, brown, purple and black around the edges of your wound. Work from the lightest to the darkest colors so they're easier to blend. Keep painting the wound until you're satisfied with how it looks. You can buy makeup kits with color palettes meant for wounds from a costume shop or online. Look up pictures of the actual wound you're trying to create so it looks authentic. Be aware that you may see some graphic images during your search. If you aren't getting a close-up shot of the wound on camera, then you don't need to spend time making a lot of details while you're applying the makeup. Take some of the fake blood you've made and paint it on the inside of the wound so it looks it's bleeding. Apply a thick layer of the blood on the inside of the wound so it appears wet and fresh on camera. Then, use a sponge to add some blood spatter around the outer edges of the wound so it seems like it's dripping out. Test how the wound looks on camera to see if you need to apply more blood.
Paint a layer of liquid latex where you want to place the wound. Put a piece of toilet paper on the latex and rip it into the shape of the wound. Brush latex over the toilet paper and let it dry. Rip the center of the toilet paper to make the wound three-dimensional. Apply lumps of gelatin around the wound if you want it to look like a burn. Use oatmeal or corn flakes to add more texture to wounds. Blend the wound into your skin tone with foundation. Paint or brush colored makeup onto the wound to make it look realistic. Apply fake blood inside and around the wound so it seems fresh.