Thanks for your query.
How old is your daughter? Apply cold
compress over the bump on the forehead so that it does not increase in size. You need to worry if you notice a change in her behaviour or vomiting
or excessive sleepiness.
The indent which you mention is usually located well behind the hair line and is known as the anterior fonatanelle. It closes around 18 months of age.
I suggest you observe your child for the symptoms mentioned above.
Wishing your daughter all the best.