A member asked:

Why do i have yellow lines under my arms?

A doctor has provided 1 answer

Yellow Stains: There are two causes of these stains. First, aluminum-based antiperspirants are acidic and contain compounds that can contribute to staining. In addition, sweat has trace amounts of urea (also found in urine), and this can contribute to the dyeing of fabrics. In general, a white shirt may take on a yellowish color, and dark clothes may become lighter.

Answered 8/10/2019

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