What Could Cause Recurrent Redness And Itchiness On The Corner Upper Sides Of My Lips?

Hi doctor Ive had some red itchiness on the corner upper sides of my lips. First I ignored them thinking it maybe due to dehydration but it is not healing, though it heals to some extend but again appears is it any kind of emergency situation? And what can I do at home to heal it. It generally heals in day time after applying loads of vasaline or coconut oil but gets worse after night when I just wake up.