Why does post-inflammatory hyperpigmentation cause uneven skin tone?

Post-inflammatory hyperpigmentation develops after irritation or inflammation, such as a spot, rash, scratch, burn, or procedure. The healing response can stimulate melanocytes, the cells that make melanin. Extra pigment may collect in the surface layers of skin or remain deeper after inflammation has disrupted surrounding tissue. The result is a flat brown, grey-brown, or darker patch beside skin that was not inflamed. Uneven Skin Tone is a very common presentation of Post-Inflammatory Hyperpigmentation. The colour may be more noticeable after sun exposure because ultraviolet light encourages pigment production.

Treat the trigger gently and avoid picking, scrubbing, or repeatedly irritating the area. Use broad-spectrum sunscreen on exposed skin and reapply as directed, because light can deepen the contrast between the patch and nearby skin. A clinician can check whether the colour change fits post-inflammatory hyperpigmentation and may suggest a suitable topical treatment or procedure based on your skin tone, the depth of pigment, and the original inflammation. Introduce only one new product at a time and stop products that sting or burn.

Arrange a dermatology assessment if the patch is changing quickly, bleeding, painful, raised, or developing without a clear preceding irritation. Seek prompt care for spreading redness, warmth, swelling, pus, or fever after an injury or procedure. A clinician should also review pigmentation that persists, repeatedly returns, or is affecting your wellbeing, since several skin conditions can look like a dark patch.

Ask what event may have triggered the pigment, whether the colour is superficial or deeper, and which ingredients are appropriate for your skin. You can also ask how to protect the area from light, how long a treatment trial should last, and which changes would warrant an earlier review.