If you notice soft or hard yellow patches on the inside corners of your eyelids, you might have xanthelasma. They're made up of cholesterol that's under your skin. They aren't harmful, but if you're bothered by the way they look, there are treatments that can get rid of them.
Even though xanthelasma itself won't hurt you, it could be a sign that you're at higher risk for heart disease. So don't ignore this skin condition. Get it checked by your doctor.