white arrow pointing up

Aesthetics

Active acne and post-acne redness

Treated with ProYellow laser

After a breakout heals, many people are left with flat red or pink marks that can last for months. They come from small blood vessels that stayed dilated after the inflammation, and they respond well to the right laser.

PIE or PIH?

Post-inflammatory erythema (PIE) is red, pink or purple and fades briefly when you press on it. It is more common in fair to medium skin. Post-inflammatory hyperpigmentation (PIH) is brown and does not blanch, because it is excess pigment rather than blood vessels. The two need different treatment, so getting this right first matters. PIH is covered on our Hyperpigmentation / melasma page.

How Dr Rob Humphries treats PIE

Dr Humphries uses the ProYellow 577nm laser. Haemoglobin in blood absorbs this wavelength strongly, so the laser closes the small dilated vessels behind the red marks while leaving the surrounding skin intact. Pigment-targeting treatments and most skincare do little for PIE because they don't address the vessels.

How many sessions will I need?

Most people need two to three sessions, a few weeks apart. Marks often look noticeably calmer after the first.

Is there downtime?

Very little. The skin may look slightly pink or puffy for a few hours.

Can PIE be treated while I still have acne?

Yes, and the ProYellow laser is actually effective for active acne too.

Book a consultation with Dr Rob Humphries at Aion Labs, London.

‍