NC because I find this embarrassing.
If you have any educated guesses on what this is Please Help.
Starting in 2012 I got these small weird patches of skin on my inner arms, then a tiny dot on my collarbone then a tiny dot of it on my stomach. The spots look almost raised when inspected closely and feel a bit off from other skin. Over time it has spread particularly while I was pregnant except my stomach where it got better
now it's all over my chest, shoulders, some on breasts and stomach and a few dots of it in other places.
Arms, hands, face, back, bum, bikini area, legs, and feet are clear for the most part or completely.
Asked a GP and nurse about it while pregnant and wasn't helped just told it probably was a side effect of my pregnancy...in 2017. 
It isn't contagious. The patches only get better when my skin is exposed to sunlight regularly. I rarely tan so only found this out in 2016 on a beach holiday.
I saw a dermatologist once who said the spots despite looking brown are in fact red and it could be an auto-immune disorder. I was tested for Lupus and thankfully it was negative.
I was also diagnosed with Raynaud's Phenomenon by a different doctor, this is only relevant because it started at almost the same time as spots appeared and Raynaud's is associated with some auto-immune disorders.
I was also misdiagnosed with something I can't recall the name of now.
I don't want to go to another doctor just to get the run around again, I'd like to go in armed with suggestions of things they could test for.