Post-Inflammatory Hyperpigmentation — Conditions

What is Post-Inflammatory Hyperpigmentation?

Brown or red marks remaining after acne or wound-related inflammation heals

Excess melanin production leaves spots darker than the surrounding skin tone, which can darken further with UV exposure.

Main causes & characteristics

When inflammation occurs from acne or a wound, melanocytes are known to become stimulated and produce excess melanin. This pigment remains in the epidermis and dermis, appearing as dark brown or reddish marks that are darker than the surrounding skin. Exposure to UV radiation is known to further activate melanin production, potentially causing the marks to deepen.

How to manage

Sun protection is recommended as the fundamental first step — applying sunscreen generously before going outdoors is advisable. Products containing tone-evening ingredients such as Vitamin C and niacinamide may help. If marks are extensive or persist for a long time, consulting a dermatologist is recommended.

Good to know alongside

Is frequently discussed alongside melasma, dark spots, melanin, and sun protection. Reddish marks may be separately classified as post-inflammatory erythema (PIE), which is associated with vascular dilation.

Everyday care tips

Squeezing or picking at acne with your hands may worsen pigmentation, so avoiding irritation is advisable. Consistent sun protection — even on cloudy days — is recommended.

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Frequently Asked Questions (FAQ)

What is Post-Inflammatory Hyperpigmentation?

Brown or red marks remaining after acne or wound-related inflammation heals. Excess melanin production leaves spots darker than the surrounding skin tone, which can darken further with UV exposure.

Related Entries

• Acne
• Atopic Dermatitis
• Rosacea
• Melasma
• Eczema
• Psoriasis
• Urticaria (Hives)
• Sunburn

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Sources & References

• Korean Dermatological Association
• American Academy of Dermatology — Diseases & Conditions
• DermNet (New Zealand Dermatological Society)
• NIH MedlinePlus — Skin Conditions

Medical Disclaimer

SKINROUTE is not a medical device or healthcare provider. All content is general skincare information for reference only. If you have concerns about your skin, please consult a board-certified dermatologist.