Choose a matte light shade of eyeshadow to use as the base colour (for example Screenface Matte Eyeshadow #201 for lighter skins or #287 for warmer skintones). Using a shadow brush, the Screenface Sable Domed 7/16" Brush is a good size, apply this over the whole eye area, blending up to the eyebrows.
When choosing the darker colours to blend with, be careful not to go too dark. If you are fair with blue/green eyes then #224 is a great shade. Otherwise, you can use a black #213 or the slightly softer charcoal #280 to blend with darker skintones. These colours really enhance the eyes!
Contour around the socket of the eye using a Eyeshadow Brush R Medium or similar and blend into the eye area no further than in line with your pupil and never blend out further than the edge of your brows.
Using a Screenface Concealer Brush, select the colours that best match your skintone. Gently stipple a small amount onto the affected area. By gently stippling, the colour will slowly camouflage in with your skintone remember, you are trying to take away the appearance of a blemish, not trying to pile on loads of make-up.
Dermacolor Camouflage Cream works a treat for covering tattoos. Choose a minipalette that matches your skintone and make sure it includes the colour D32. This colour is used first on the tattoo to neutralise the blueness or shadow created by the tattoo. Stipple only on the blue/black of the tattoo, not over the whole area. Very lightly set this with powder so that it doesn't shift when you continue. Start stippling the fleshtones over the area (you may need to mix several colours to get a good match). When you are satisfied with the finished product, set the whole lot with Fixing Powder or Fixing Spray. It may take you a couple of tries to get it right, but it's worth it.
Photograph Courtesy of the Ben Nye Company Showing use of the Ben Nye Concealers also used for tattoo cover.