Perspiration has the nasty habit of turning fabrics yellow. Yellow perspiration stains often occur in the armpits of shirts. This occurs in people free of disease. If you google "perspiration stain removal" you will find a bunch of different methods listed to remove the stains. I have tried many over the years and have never found anything to remove it all the way. Once the fabric turns yellow it is too late in my opinion. I have gotten wiser and now pay attention to possible stain sites before they change color.
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CD, Ankylosing Spondylitis, lupus, small fiber peripheral neuropathy, avascular necrosis, peripheral artery disease, degenerative disc disease, and a host of other medical problems.