seborrheic Keratosis

There was a paper on the treatment with vitamin D3... will see if I can find it.

Here it is but not sure if you need access rights:
onlinelibrary.wiley.com/doi/abs/10.1111/j.1346-8138.2005.tb00772.x

Might be worth discussing with your doctor though as they would definitely have access may not know about it. They may prescribe for you.

I've got several small ones around my neck (where a blouse collar would be), but I've grown my hair to almost shoulder-length now, so they aren't visible. I wear make-up, so my face is noticed more than my neck, anyway.