Which factor is MOST likely to contribute to post-inflammatory hyperpigmentation after acne?

Post-inflammatory hyperpigmentation (PIH) often occurs as a result of skin inflammation or trauma, such as that caused by acne. The condition is characterized by darkened areas that remain after the acne has healed. Among the factors listed, sun exposure after healing is particularly significant in contributing to the worsening of hyperpigmentation.

When skin is inflamed due to acne, it is more sensitive and prone to damage from UV rays. After the inflammation subsides, any sun exposure can lead to a darker pigmentation in the affected area. The ultraviolet (UV) light from the sun stimulates melanocytes, the cells responsible for producing melanin, which can exacerbate the discoloration that follows acne lesions. Therefore, individuals who have recently experienced acne lesions must take precautions against sun exposure to reduce the risk of developing post-inflammatory hyperpigmentation.

The other options do not have as direct a correlation to the increase in pigmentation after acne healing. Exfoliating products can assist in skin turnover and may even help in reducing hyperpigmentation over time when used correctly. Low dietary fiber intake is not directly connected to skin pigmentation issues, and non-comedogenic products are specifically designed to avoid clogging pores and are less likely to aggravate acne or contribute to post-inflammatory changes