Diabetes.co.uk said on their website: “Acanthosis nigricans is a relatively common skin condition that is one of the symptoms of diabetes.
“Acanthosis nigricans is characterised by darkening of the skin at particular areas.
“It is not a dangerous condition in itself but is typically a sign of the presence of a problematic condition such as type 2 diabetes and sometimes cancer.
“The signs of acanthosis nigricans are quite distinctive and result in a darkening of the skin around folds of skin, typically affecting the groin, neck, armpits or joint of the fingers or toes.
“As well as being darker, the skin may take on a leathery or velvety feel and the skin may itch or smell.”