Lisa. I was diagnosed age 7 so had no tattoos at the time. I've now got three - one of my back, one on my wrist, and one on the top of my foot. I've had no problems with any of them. They took a little longer to heal than 'normal' (sorry to use that term) people, but not much longer. The one on my foot is the most recent - about three months ago actually. I was a little worried about healing. The tattoo place asked if I was diabetic and I confirmed that I was. Seeing I had other tattoos they were happy to go ahead. I've never had any problems with my feet so went ahead - you only live once eh?!
One thing I will say - it HURTS! By far the most panful tattoo I have had done. I hope you are braver than me lol.
Good lick with it