Skin darkening (hyperpigmentation) is a common change in skin colour that can have many causes. Below you’ll find clear information on frequent causes, how health professionals evaluate it, general prevention and the warning signs that should prompt medical review.
Darkening may be localised or widespread. Frequent causes include increased melanin from sun exposure (solar lentigines), hormonal pigmentation such as melasma, and post‑inflammatory hyperpigmentation after injury or inflammation. Some medications, chemical exposures, genetic tendency and—less commonly—metabolic or endocrine conditions can also cause skin darkening. The pattern, timing and any accompanying symptoms help narrow the likely cause.
Most cases are not emergencies. However, seek prompt medical attention if the darkening spreads rapidly or is accompanied by severe pain, intense redness, marked swelling, blisters, open wounds, bleeding or fever. Also seek prompt review for new systemic symptoms (unexplained weight loss, fatigue, difficulty swallowing) or if a mole‑like spot changes shape, size or starts to bleed. For life‑threatening signs, contact local emergency services.
A clinician will usually start with a visual skin exam; dermatoscopy may be used to look at pigment patterns. Photographs, blood tests or hormone tests can be ordered when a systemic cause is suspected. In some cases a skin biopsy is needed to confirm the diagnosis. Dermatology is the typical specialty for assessment; primary care or endocrinology may be involved if systemic disease is suspected.
General measures that can reduce risk or limit worsening include regular sun protection (broad‑spectrum sunscreen, hats, protective clothing), avoiding irritant chemicals, gentle cleansing and avoiding vigorous scrubbing. Picking or applying unverified chemicals to lesions can worsen pigmentation. These are general tips—speak with a clinician for care tailored to your situation.
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