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
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.