About 7 months ago I noticed two weird marks, one on my upper thigh and one on my calf on my right leg. I kept an eye on them and they didn't seem to grow but they're not going away. In the past week I noticed two more marks, one on my upper inner thigh and one on my foot on the left leg. Here are some pictures here https://postimg.cc/gallery/72R7kXz
They're all smooth and non itchy, does anyone have any idea what this could be?