Assuming you're working at a detailed level, have you tried painting over them with the Spot Healing Brush tool and a small brush?
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The technique I use is the clone stamp tool with the blend mode set to lighten and the flow and opacity set to around 30%. This will just effect the veins and not anything else and it looking too bright and unnatural. With a low flow and opacity use a small brush and keep going over the veins until you are satified with the result. Another point, the veins are natural and I find it looks better toning them down rather that totally eliminating them
Hope this helps
Noel and Mike's responses should help you out. You can also post the photo that you are trying to fix so we know what to reference from.
You may find this tutorial helpful:
In addition to the tips already given, you might want to watch Terry White's webcast on Photoshop TV titled "How to Retouch Eyes using Photoshop CS6) (actually, the tips can be followed with older versions of Photoshop as well): http://tv.adobe.com/watch/creative-suite-podcast-photographers/how-to-retouch-eyes-using-p hotoshop-cs6/
When Clone Stamp Tool and Healing Brush Tool are insufficient I like painting on a separate Layer with a Pattern Overlay of a neutral noise set to Linear Light and reduced Opacity to emulate the images’ noise/grain.
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