Final answer:
Acanthosis nigricans is the common condition that causes velvety, hyperpigmented plaques on the skin. It is often associated with insulin resistance and is commonly seen in individuals with obesity, type 2 diabetes, or polycystic ovary syndrome.
Step-by-step explanation:
The common condition that causes velvety, hyperpigmented plaques on the skin is called acanthosis nigricans.
Acanthosis nigricans is a skin condition characterized by thickened, darkened, and velvety plaques. It usually occurs in areas with skin folds, such as the neck, armpits, and groin.
This condition is often associated with insulin resistance and is commonly seen in individuals with obesity, type 2 diabetes, or polycystic ovary syndrome.