Hello,
FRrom the symptoms it can be hyperpigmentation skin or acanthosis nigricans. It presents as symmetrical, hyperpigmented, velvety plaques mostly in the folds of skin. It is not itchy and is characterized by hyperpigmentation. My sincere advice is to consult a dermatologist. Biopsy skin may be done to confirm the diagnosis.
I hope it helps. Take care and please do keep me posted on how you are doing or if you have any additional doubts. Kind regards.
my daug\hter is 11yrs old & has dark color around her neck. i have tryed sopa &water,biooil,& skin fade cream. is there anything i can use to help her out?