Pseudo acanthosis nigricans is a skin condition marked by dark, thickened, and velvety patches, usually appearing in the neck, armpits, groin, or other body folds. Unlike true acanthosis nigricans (which may be associated with insulin resistance or internal disease), the "pseudo" variant typically occurs due to friction, obesity, or lifestyle factors and is not linked to hormonal or metabolic issues.

Pseudo acanthosis nigricans typically presents as:

Skin Darkening – Brown to black patches with a velvety texture.

Thickened Skin – Thickening and roughness, especially in skin folds.

Affected Areas – Most common on the neck, underarms, groin, thighs, and elbows.

No Systemic Symptoms – Generally painless, but may cause cosmetic concern or irritation.

Overweight individuals, people with darker skin tones, and those living in hot, humid climates are more prone to pseudo acanthosis nigricans. It is also more frequent in adolescents and adults with sedentary lifestyles and poor skin hygiene.