Please what should I be rubbing on the blinking part of my baby's head?
The "blinking part" is called a fontanelle and it is a soft spot of a baby's head where the bony structures of the skull haven't joined and the only thing you need to do is leave it alone. Rubbing anything can potentially cause harm for the baby.
You do not need to mop the fontanelle with hot water or apply any substance herbal or local, just leave it alone.