sorry for the bad quality, my phone is bad up close
I hit my pinky finger real bad while hammering a nail when I was a kid, it broke off some of the skin but when it grew back it kinda has a divit in it. Doesn’t hurt or cause issues in any way but it’s just kinda a interesting part about my body that’s unique and I probably wouldn’t fix if given the chance.
I’ve come to love these little inconstancies that shows that a body has been used for fun and living, scars with a story are really sweet.
I don’t mean to suggest that you do - I’m nowhere near knowledgeable enough to do so. However, from my inexpert knowledge, nothing you said contests the possibility.
Apparently a birthmark on your lumbar region can be indicative of a pilonidal cyst, not a problem itself. They’re genetic. The cyst happens (from my very limited knowledge based only on having experienced it) when your tailbone doesn’t close fully and hair on your buttcheeks grows across the gap, collecting in the resultant opening in your spine.
I hope you don’t have one! Mine was no fun to remove.
edit: I missed the first time reading your comment that you said it was halfway up your back. From my understanding that’s not common for the affliction I described. I apologize for making assumptions.
I did look up pictures, and I have experienced nothing like that. Thanks for the new fear, though! Cheers!
Happy to be of service!
In case of actual concern … If you had one, you would probably know. Mine was not subtle, at least.