This article is from the Tattoo FAQ, by Stan Schwarz with numerous contributions by others.
Tattoos can definitely be affected by stretch marks. Whether you will or
won't get stretch marks is apparently determined genetically, so
placement is a consideration if you are planning on getting pregnant. I
know for a fact that stretch marks can ruin a tattoo, because I have a
very small tattoo that now looks more like a blob because of a large
stretch mark running through the middle of it. Luckily, this was a
home-brewed job (the kind done with India ink and a pin wrapped in
thread) so I was never particularly attached to the artwork. :-}
If your skin stretches from weight gain and then shrinks back up without
losing its elasticity (the loss of elasticity is what results in stretch
marks), then I would expect that there wouldn't be much distortion of
the tattoo, maybe none at all.
Or, put the tattoo someplace that won't get stretched so much, like the
chest area above the breasts. My upper stomach didn't stretch much,
either, but the lower abdominal skin did stretch quite a lot. (I've seen
stretch marks on hips, thighs and arms as well--probably related to
muscle gain from weight lifting as well as general fattening/thinning.)
 
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