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Your pubic area is very sensitive and vulnerable to harsh chemicals. Read the ingredients list on the back of the box of hair dye to make sure it doesn't contain ammonia or parabens that could irritate your skin. Look for dye that's labeled "chemical-free," "organic," or "all-natural." You can use any color dye. Pick a color that matches your hair or, for a playful look, pick a bright color like pink or blue. Petroleum jelly acts like a barrier between your skin and the dye so it doesn't stain or irritate certain spots. Rub a thin layer onto your labia, vulva, penis, or scrotum. Avoid getting petroleum jelly on the hair you want to dye since the jelly blocks the dye. Your box of hair dye will contain instructions for how to prepare the dye. It should also include plastic gloves. Place them on your hands before you begin working with the dye to protect your skin. If your hair dye doesn't come with gloves, you can buy them at any beauty store, grocery store, or online retailer. Test a small amount of dye on your skin before applying all over to make sure you don't have an allergic reaction. This dilutes the dye so it isn't as harsh on your pubic area. Pour the same amount of shampoo as there is dye into the dye itself. Mix the 2 together with a spoon until thoroughly combined. The exact amount of hair dye should be listed on the front of the box. Use that measurement for your shampoo. For example, if you have 3 ounces (85g) of hair color, you'll add 3 ounces (85g) of shampoo. Choose shampoo that has hydrating ingredients, like argan oil, vitamin E, or Moroccan oil. Avoid one that has parabens, which will irritate your skin. Use the hair dye applicator brush to gently apply the dye, making sure to completely saturate all of the hair. Avoid rubbing the dye or letting it get into any super sensitive places, like inside your vagina. Most boxed hair dye will come with an applicator brush. If yours doesn't, buy one from a beauty store or an online retailer. You can also use a small paintbrush with bristles instead the hair dye brush. This allows the color to fully soak into your pubic hair. Check the directions provided with the hair dye to find the exact processing time for that specific brand and type. Some dyes may be closer to 20 minutes. Wash off the dye immediately if you experience any burning or painful tingling sensations. Set a timer or use the clock app on your phone to keep track of the time. Don't leave the dye on for longer than the recommended time or you could damage your pubic hair and skin. Stand under the shower so the water runs over the dye, removing it from your pubic hair. Gently rub the area with a clean washcloth to get rid of any excess dye or petroleum jelly, too. You'll know that all of the dye is gone once the water runs clear. If there's any dye left on your skin after you dry off, dab the area with a cotton ball dipped in astringent or witch hazel to remove it. Once it dries, if you aren't satisfied with the color, you should wait 4 weeks before re-dyeing it so you don't damage your hair.

Summary:
Choose a hair dye without ammonia or parabens. Apply petroleum jelly to the most sensitive areas to protect them. Put on plastic gloves and mix the hair dye according to the directions. Stir an equal amount of moisturizing shampoo into the dye. Brush the dye onto your pubic hair. Let the dye sit for about 30 minutes. Rinse off the dye with warm water and a washcloth.