Why my husband's side of the bed is stained yellow?

The yellow stains on your husband's side of the bed could be caused by a few factors, such as sweat, body oils, or Skin Care products. It's also possible that certain dietary choices or medications could contribute to discoloration. Regular washing of bedding and using a mattress protector can help prevent and manage these stains. If the stains persist, it might be worth investigating any specific habits or products that could be causing them.