Stockbyte / Getty Images
I get yellow pit stains from sweating. What causes this, and how can I avoid it?
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.
Try using antiperspirants after showering in the morning and before going to bed to decrease your total sweat production. Antiperspirants work better if you do not sweat after applying. Another option is to consider getting Botox injections in your armpits. This can dramatically reduce sweating in most patients. If the yellow stains are really bothering you, stick with deodorants that have no aluminum chloride in them. Deodorants serve only to mask the odor, but will not reduce sweat production like an antiperspirant.