Common triggers include acne lesions, cuts, burns, or skin conditions like eczema.
[1] Additionally, UV sun exposure and sunburn are involved in the development, darkening, and expansion of hyperpigmented skin lesions.
[2] Some medical procedures performed on the skin can cause an inflammatory reaction, which may lead to hyperpigmentation, even if the inflammation itself is temporary.
[4] A diagnosis of postinflammatory hyperpigmentation is established based upon its clinical presentation coupled with a recent history of inflammation over the same area.
Diagnostic tests are not required, but can rule out some other conditions, such as Addison's disease or systemic lupus erythematosus.