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What causes Post Inflammatory Hyperpigmentation (PIH)?

  1. Lack of perspiration

  2. Bacterial conjunctivitis

  3. Trauma leading to dark irregular patches

  4. Contagious viral infection

The correct answer is: Trauma leading to dark irregular patches

Post Inflammatory Hyperpigmentation (PIH) is a form of hyperpigmentation that occurs when the skin produces excess melanin in response to an inflammatory injury. This melanin production results in dark irregular patches on the skin. This condition can be triggered by a variety of factors such as acne, eczema, psoriasis, or any other inflammatory skin condition. Options A and B are incorrect as they have no connection to the inflammatory response and melanin production. Option D is also incorrect as PIH is not caused by a viral infection. It is important to protect the skin from any kind of physical and chemical trauma to prevent the development of PIH. Therefore, option C is the correct answer as it directly relates to the cause of PIH.