Red blotches

I've had these red blotches on my neck area for a while now (I can't remember when I first noticed them) and I can't for the life of me figure out what they are. They don't itch, burn, sting, etc. I don't feel them at all. I only know they are there by sight.  I'm going to have my NP try to help me figure out what this could be.  It could be anything from food allergies to gut bacteria imbalances.  Let's hope I can get some answers!