Can insect bites cause post-inflammatory hyperpigmentation?

The mark usually appears after the bump, redness, or itching has started to settle. It may be brown, grey-brown, or darker than the surrounding skin, especially where the bite was scratched or more inflamed. This change is pigment left after inflammation, not dirt trapped in the skin. Sun exposure can deepen the contrast, and the colour may fade gradually as the skin renews, although the timing differs between people.

Leave healing skin alone as much as possible and avoid picking scabs. Once the surface has closed, protect exposed areas from sunlight with clothing or broad-spectrum sunscreen. Use gentle, fragrance-free products and stop any product that stings. Do not use strong bleaching mixtures or steroid creams without medical advice. A clinician can discuss suitable pigment treatments after checking that active inflammation or infection has resolved.

Arrange an assessment if the spot is changing quickly, bleeding, painful without the original bite, repeatedly crusting, or different from nearby marks. Seek prompt care if redness, warmth, swelling, pus, or worsening tenderness returns, as that suggests ongoing inflammation or infection rather than settled pigmentation. Widespread symptoms after a bite, including breathing difficulty or facial swelling, need emergency help.

Ask whether the colour change is post-inflammatory hyperpigmentation, which ingredients are appropriate for your skin, how to prevent another bite from leaving a mark, and whether the lesion needs examination before treatment.