My baby is 5months 15days old I am feeding him bm only... but he has this on his head it looks like a pressed skin... what is this?? What does this indicate?? What are the solutions?? Why does this happen??

A. hello dear actually it is not cleared at which part of the head you are showing is it in the front or in the centre of from the back to can you please post the picture once again so that it should be more clear because it can be fontanelle as well which is very normal