I have a friend, female, celtic, 38, 164cm, 60kg, wheat and gluten intolerant.
She has the appearance of acanthosis nigricans on the front of her neck in a band from ear to ear extending about 4cm down her throat. It's fine-pebbly, gray, uniform and matches what photos I've seen on Google. She's not, as far as she knows, diabetic. It's been there at about nine years without much variation. The last doctor she showed it to treated it as eczema and she's never been back. She's occasionally dizzy but she doesn't faint.
I'm puzzled firstly that it's on the front of her neck and not the back. Does that indicate acanthosis nigricans is a wrong description despite the similarity of the look?
If it's right then I presume it's caused by a raised insulin level and ought to be investigated. Finding a doctor who would take it seriously enough to check has been the reason it's not been done.
Is the food intolerance possibly associated?
Her comment on reading this is: "I have had no specific treatment for that area alone ever, just the dermatologist calling it staining when the nurse asked him what it could be, that was at a general run of the mill check up after my discharge from hospital". The only "treatment" she's tried is rubbing it raw with frustration trying to get rid of it.