Discoloration of Skin

Normal skin contains cells called melanocytes. These cells produce melanin, the substance that gives skin its color.

Skin with too much melanin is called hyperpigmented skin. Causes may include:

• Skin inflammation (post-inflammatory hyperpigmentation)
• Use of certain drugs (such as minocycline and birth control pills)
• Endocrine diseases such as Addison disease
• Hemochromatosis (iron overload)
• Sun exposure
• Pregnancy

Skin with too little melanin is called hypopigmented skin. Possible causes are:

• Skin inflammation
• Certain fungal infections (such as tinea versicolor)
• Pityriasis alba
• Vitiligo
• Certain medicines
• Skin condition called idiopathic guttate hyomelanosis