Why dark spots linger (and what an even tone really means)

A spot fades, then seems to settle in. Uneven tone is one of the most common reasons people start reading labels, and one of the slowest things to change.

“Dark spot” covers several different things: marks left after a breakout or irritation, sun-related spots, and patterned pigmentation such as melasma. They look alike in a mirror and behave differently.

Colour in skin comes largely from melanin, made by melanocytes and passed to surrounding skin cells. Inflammation, UV, and visible light can all nudge that system to produce or transfer more.

Pigment sitting in the upper layers tends to fade faster than pigment deeper in the skin. That is part of why some marks take weeks and others take many months.

Because new triggers keep the system active, daily sun protection is usually the foundation that lets any other step show its effect.

• Daily broad-spectrum sunscreen, reapplied when outdoors.well-supported
• Azelaic acid for post-inflammatory marks and uneven tone.well-supported
• Niacinamide for the look of uneven pigmentation.limited evidence
• Retinoids for overall tone and texture over months.limited evidence
• Tranexamic acid (topical) for stubborn pigment.limited evidence

• Most botanical “brightening” extracts at the unknown concentrations used in products.
• Any claim of visible results in days. Pigment turns over slowly.
• Products marketed for “whitening”. That's not a goal we support, and some contain unsafe ingredients.