Apparently these can sometimes give you information about something wrong with your health.
it's easy to find some info about this when you google.
I think i used to have these when i was younger, now i don't have them at all, I don't need to make pictures, you may have noticed this when watching some of my videos:
https://youtu.be/y4ly1mHFRtk?t=356 I have known this for some time. When i asked about this to my modern medicine doctor she said it's normal (I knew she was going to say this).