No, they are not acronyms for expressways. Post-inflammatory erythema (PIE) and post-inflammatory hyperpigmentation (PIH) are skin conditions that leave red, purple and dark-coloured marks on your face. In short, inflammation can leave long-lasting consequences on your face.
As the medical director at Sozo Aesthetic Clinic, I come across many troubled patients seeking treatment for their "colourful" problems. Perhaps, you are like them too.
Here from me as I explain what PIE and PIH are, how they are different in nature, their causes, and treatments I use to reverse their effects.