Lump on Babes head?

Picture for attention:)

About a month & a half ago I noticed a pea sized lump on the side of babes head, like near her temple. So I googled & just figured it was just a lymph node, and that’s I would bring it up at her 9 month appointment. So today was the appointment & her pediatrician said she can not give us a diagnosis because she has no idea what it would be, but to keep an eye on it & watch for size change. So now I’m super paranoid & scared.

Just wanted to know if any ones child had something similar & what the results were! Thank you!