How common are dark patches on skin in hyperpigmentation?

Hyperpigmentation means that an area of skin has more visible colour than the surrounding skin. It can follow acne, eczema, injury, burns, or other inflammation; it can also be influenced by daylight, hormones, medicines, or natural variation in pigment. Patches may be light brown, dark brown, grey, or uneven, depending on the depth and type of pigment. Their appearance does not reveal the cause by itself, so the timing and skin history are useful clues.

Use broad-spectrum sun protection, reapply it as directed, and avoid picking or rubbing the area. Keep irritated skin comfortable with a gentle cleanser and moisturiser. If the patch persists or affects your wellbeing, a dermatologist can identify likely triggers and discuss treatments that match your skin type. Avoid unlabelled lightening mixtures, which may irritate skin or cause uneven colour.

Arrange a review for a new or changing patch, especially if it grows quickly, has an irregular edge, bleeds, crusts, becomes painful, or differs from your other marks. Also seek advice when pigmentation follows a medicine or widespread rash. Sudden extensive changes with feeling unwell need prompt medical attention.

Ask what may have triggered the pigmentation; whether the patch needs examination; which sunscreen and products suit your skin; how long improvement may take; and how to reduce the chance of new darkening.