Hampton University Skin of Color Research Institute
 

Post-inflammatory Hyperpigmentation


People with skin of color make up a broad range of ethnic groups and races; they include Africans, African Americans, Asians, Native Americans and Hispanics. Analysis of population-based statistics indicates a shift in the nation’s demographics; the U.S census bureau predicts that ethnic minorities will represent more than one-half of the U.S. population by the year 2050. This shift in demographics indicates the need for a more comprehensive understanding of skin disorders more common, unique, or that have a distinct presentation in individuals with skin of color.

Pigmentary disorders, either lightening or darkening of the skin, are a common concern in persons with skin of color. In fact several studies have found that disorders of pigmentation were amongst the most frequent reasons for visiting a dermatologist.

What is post-inflammatory hyperpigmentation (PIH)?
Post-inflammatory hyperpigmentation (PIH) is darkening of the skin that results after an underlying skin condition has healed or after injury to the skin has occurred. Some of these underlying skin conditions include disorders such as eczema, acne, and psoriasis.

Who gets PIH?
While PIH is observed in all skin tones, it is particularly problematic and more apparent in individuals with darker skin. The color of the skin lesions can vary from light brown, to dark brown to blue-gray.

Why does PIH occur?
PIH can occur in anyone but is more common in people with darker skin. Scientists do not know exactly how PIH occurs or why certain people are more prone to its development. By investigating the molecular mechanisms of PIH, researchers at the Hampton University Skin of Color Research Institute hope to develop a better understanding of the etiology of this common clinical phenomenon.

If left untreated, how long does it take for PIH to resolve?
It may take as many as six to twelve months before the pigment is restored to the desired level.

What is the treatment of PIH?
The treatment of PIH can be a challenge especially in darker skinned people because many of the treatment options can cause irritation, which may actually exacerbate the hyperpigmentation. In addition, wearing a broad-spectrum sunscreen is critical for people with or susceptible to PIH as sunlight can exacerbate the hyperpigmentation.

You should consult with your doctor who will decide which treatment best suits you.

Treatment options include numerous topical preparations which are available over-the-counter or in prescription strength:

In addition, chemical peeling agents may also be helpful for more recalcitrant cases.