Circular indentations on leg

Question: My husband has these weird circular indentation on his legs. For years (30 or more) he's had one. It's about 1/2 inch across, perfectly round, indented 1/8 of an inch, purple tinted interior. It hasn't grown, it doesn't hurt. It just sits there. Today I was looking at his legs and he's acquired several more, slightly smaller ones. The doctor dismissed it, though he couldn't say what it was or what was causing it. Any clues? Is this something serious?

I suggest you see a different doctor in person so that they may have a visual of the area, your best choice would be to see a dermatologist for further consultation and treatment. Best skin care wishes.

Meagan, Esthetician