The spots where the ink is missing are commonly referred to as "holidays" A euphemsim for the artist being on holiday while they were tattooing that spot on you. With black work they are not uncommon and are easy to fix.
Lotsa reasons you might have got them. Could be how the artist put the ink in, could be you used to much moisturizer during the beginning of the healing process etc... Bottom line is once you have healed, get them fillied in and find someone you trust do do any future tattoos.
Check out
www.tattoos.com for a listing of studios by location and you can check out their site or online portfolios before you ever leave your desk.
