Thankyou for choosing HealthcareMagic. The dark marks under a baby's eyes could be due to marked dehydration
maybe due to diarrhoea
, cholera, malnutrition
, some kind of allergy or even surgical problems like pyloric stenosis
. And obviously its treatment should not be/ only creams. PLease get it checked by a paediatrician and treat the cause. Wish yoour baby quicker recovery.