I'm not sure if you mean 'can they be masked using tattoos?' or 'Is it safe to tattoo over them?'
I know that one way of masking stretch marks is to tattoo over them; however, thread veins can be fairly easily (although possibly more expensive than tattooing) removed using pulsed laser therapy.
As for the safety issue, I can't see it being any more risk than a regular tattoo - I have thread veins on my torso around my rib area but if and when I get them treated I will go for the laser option.
Jason
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