Information is limited as to the risks related to preexisting tattoos tatoos and pregnancy. It is important to inform your physician of any and all tattoos and the age of each to minimize any possible risks. But as your body changes, your tattoo likely changes too, and there is no guarantee it will look the same after the pregnancy.
If you notice any changes in the tattoo area you need to seek treatment. Signs to be aware of are pain, swelling, redness, and/or warmth. It could be possible that the area could begin to pus or show red streaks radiating outward. It is important you discuss any of these symptoms with your physician.
Other concerns are dirty needles that could possibly spread disease. If you are not sure the tattoo parlor followed all health and safety regulations, ask your physician to test for Hepatitis, Syphilis and HIV. These could possibly be transmitted to the fetus during delivery if not detected early.
Lower back tattoos are becoming more common.They may have some effect on pain relief during delivery because an epidural is placed in the lower back. Most physicians will allow epidurals if the tattoo is not recent, though it's preferred to not place the needle through the tattoo.
It is best to discuss any concerns with your physician and anesthesiologist for recommendations and concerns. Also it is recommended to check with the hospital as to their policy, if any, concerning lower back tattoos and epidurals.