Welcome to HCM.
He needs to be checked if---
1. He Throws fits
2. He Vomits,
3. He has Blood coming through the ear, nose or throat.
4. He is lethargic and not active.
5. You are worried.
It just looks like blood clot in the scalp
, but it is wise to consult, as we cant see him physically.
Wishing him best health,