Detailed answer

Hyperpigmentation is usually caused by factors such as hormonal changes, sun exposure, inflammation, or injuries to the skin. Tight bras or undergarments do not directly cause hyperpigmentation. However, prolonged pressure or friction from tight clothing can lead to skin irritation, redness, or darkening of the skin in those specific areas. This is known as post-inflammatory hyperpigmentation, which is a temporary condition that can fade over time once the pressure or friction is removed. If you are experiencing hyperpigmentation, it is best to consult with a dermatologist for a proper diagnosis and treatment plan.