Why do babies' eyes turn blue at the corners

Patient's question:

The child was born not long ago, and their eyes always tear up, and they always cry a lot. Please ask why the corner of the baby's eye is turning blue

Doctor's answer:

It's not necessary to translate the return key, keep it as it is. All other Chinese text should be translated into English:
It's not just bruising that causes skin to turn blue that you need to check if there's a problem with your platelets. Check your platelets. If it's a bruise, you can promote the dispersion of the bruise by massaging the affected area and applying heat to it. You can also apply honghua oil to the affected area to speed up the dispersion of the bruise.
Color blindness is a congenital visual impairment that affects color perception. There are several types of color vision impairment, the most common being red-green color blindness. Wearing color blindness glasses can turn previously indistinguishable colorblind test charts into ones that can be correctly identified, achieving the effect of correcting color vision impairment [5].