Is There a proper for a man to inform a woman that she has what appears to be period blood on her jeans?

Lonesomecowboybill
Is there a proper way for a man to tell a woman that without seeming gross? Also, if a man told you this, would be grateful or mad at him? Help a clueless yet well meaning dude out. :)
Is There a proper for a man to inform a woman that she has what appears to be period blood on her jeans?
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