My 9 year old autistic daughter has developed a thick layer of dark crusty patches under her arm pits, under her breasts, and around her neck. Do you know what this is called and how can it be treated? When she was born, she went to the NICU at 6 hours old with blood sugar of 15. She was there for two weeks then D/C home only after she was forced fed every hour to keep blood sugar above 60. She outgrew this problem at 4 months, and was D/C from Endocrinologist care. Could these darken areas be associated with blood sugar issues? Also just to let you know she has no controll to stop eating and her current weight is at 150 lbs and she is very active.
This could be acanthuses Nigerians which is often a skin symptom of diabetes or a warning sign that diabetes is developing.  I would recommend ad Chat Doctor.