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What Are The Causes of Acquired Hyper-pigmentation?
The causes of acquired hyper pigmentation can roughly be broken up into endogenous and environmental causes.
Endogenous causes include:
Solar lentigines
Melasma
Scars
Ephelides
Other rare systemic skin diseases
Hemochromotosis (iron pigment)
Renal Failure
Liver Disease
Pituitary tumors
Pregnancy
Chronic stress
Environmental causes are:
Ultra-violet irradiation (e.g. Sunlight, tanning beds)
Photo-sensitizing agents
Cosmetics
Pharmaceuticals (estrogen, antibiotics, phyenyltoin, phenothiazines)