faint blotches with outline

[beegjeem1]

So I noticed these just slightly darker than my skin blotches with outlines (some more noticeable than others) all over my body (kind of hairy so its just a guess for some parts) . I am quite tan and to most people they are unnoticeable but I noticed them while checking my skin out. I may have had them for a long time but not noticed. The most noticeable are on my palm and back of hand to me since i have just started a job where i sit at my desk and see my hands all the time. it looks like it is under my skin. I sweat a lot and i used to assume a mark like this would have been tinea versicolor but the marks on my hands and palms confuse me.
thanks in advance

[purple1234567]

Some skin discoloration can be pretty normal for various reasons, but it's probably not a bad idea to have a doctor take a look at what you are seeing  as a precaution.  They likely will need a bit more background information from you in order to determine the cause a bit more accurately then we can do here.  

[beegjeem1]

the blotches vary in size more than a few inches from one side to other for some and much smaller for others and are not always circular but some are