Several strange things but now skin scar with no injury, pock like mark

Hi everyone

I wonder if anyone here has had anything similiar.

Last year I had what looked like a brown age spot appear on my arm.  Over a 5 month period the mark began to indent and sink in.    The mark was a few CM wide.  It's growing in size and denting in further.  It's about the size of a pencil eraser.  I did not bump, hurt, cut or injur this area at all.  It appeared from nowhere.

Seeing derm in September.  Does not look like a skin cancer but more some sinking skin condition?  Anyone else have this?

I lean autoimmune because my hair has been falling out for 6 years painfully.  Pink irritated painful scalp and diffuse hairloss.  Nose hair and lashes and brows diffusely thin.  No patches.  Felt sick for 10 years.  All autoimmune testing thus far (very extensive) has been normal.

Thanks people for listening!

[ewford]

search www.immed.org about autoimmune diseases, especially if AI tests seem to come back neg or within range.