Week old foot tattoo has a red spot?

I got a tattoo on my foot about 8 days ago, and so far the healing has gone perfectly. It's scabbing like expected and I've been following my artist's suggestions on cleaning it and what lotion/ointment to use.

However in the last couple of days I've noticed there is a small part of my tattoo that is red around the tattoo its self. It hurt a little when I touch the skin around that spot, but it's not hot or pussy at all. The tattoo part feels fine, it's just that tiny little spot. Is this an infection starting, or just a spot that got bumped a while back without me noticing?

I know wearing shoes is a big no-no with a foot tattoo, but with my job I have to wear shoes. I have boots that are loose around my foot that I've been wearing. Is there a chance that my boot rubs on that spot and that's why it's a little red? Also I only wear the boot for about 2 hours every other day. So I'm not wearing boots for 8 hours every day.

I'm going to call my tattoo artist tomorrow and ask him, just wanted to get some ideas before. Thanks ahead of time.