It's not uncommon to notice yellow stains appearing on your pillows after a lengthy period of time, but not many know how to actually remove these unwelcome marks, or how to prevent them in the first place.
There's many different things which cause the stains but according to experts at Lifehacker, sweat is the most common reason behind them.
Moisture from our heads seeps through the pillowcase and can result in nasty yellow stains, with those who sweat more experiencing more severe staining, according to The Mirror.
Other things that can cause the yellow marks include greasy hair or wet hair, drool, or even certain skincare and makeup products.
Read more on ok.co.uk