Several Causes: There are several potential conditions causing your mom's hyperpigmentation in her axillary region (armpits): Melasma - especially if she was started on estrogen therapy. Acanthuses nigricans - due to hyperinsulinemia Tinea Crura - Fungal infection Erythasma - Bacterial Skin Infection Systemic conditions - Addisons, Hemochormatosis Drug reaction I would need more information to determine cause.
Answered 4/20/2017
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