What causes post-acne red and dark marks?

Post-acne red and dark marks are very common conditions that occur after acne inflammation. They are caused by the skin’s natural healing process (post-inflammatory changes).

When the skin becomes inflamed, the body sends various cells to repair the affected area, such as:

• White blood cells, which help control inflammation and may contribute to pus formation in inflamed acne
• Blood vessels and red blood cells, which can dilate in the affected area, leading to visible “red marks”

What is the difference between red marks and dark marks?

Post-inflammatory erythema (red marks)

These are caused by the dilation of blood vessels after inflammation. They are commonly seen in newly inflamed acne lesions.

Post-inflammatory hyperpigmentation (dark marks)

These occur due to increased melanin production after inflammation. They are often found in acne that has been inflamed for a longer period or triggered by sun exposure.

Why do some marks fade quickly while others take longer?

If acne is treated early and the inflammation is mild, the marks usually fade more quickly and the skin can return to normal.

However, if acne is left untreated for a long time or is picked, squeezed, or irritated, it can lead to red or dark marks that last longer.

In general, acne marks may take around 3–6 months to gradually fade, depending on skin type and aftercare.

How to care for acne marks

1.Topical treatments and anti-mark products

• More effective for dark marks than red marks
• Should be chosen carefully to suit facial skin, which is sensitive and easily irritated
• Avoid ingredients that may cause irritation, especially for sensitive skin

2.Medical treatments

• Such as exfoliation treatments or pigment-reducing procedures
• Help accelerate skin renewal and reduce the appearance of acne marks
• Should be performed under a doctor’s supervision to ensure safety and suitability for the skin condition

Summary

Post-acne red and dark marks are caused by inflammation and the skin’s natural healing process. Proper early care can help marks fade faster and reduce the risk of long-lasting pigmentation.