Dark Patches of Skin
One of the early signs of prediabetes and diabetes is dark patches of skin on the armpits, groin, and neck that feel velvety to the touch. While it may at first appear as if something external may have discolored your skin, you will notice that no amount of scrubbing will get rid of the patches. This condition is called acanthosis nigricans, and it is not contagious. While many individuals without any underlying health issues get this condition too, it is often a sign of an undiagnosed medical condition, such as prediabetes or diabetes. Since it is often linked to insulin resistance, it’s best to have it checked out by a doctor.