rear its (ugly) head
US /rɪər ɪts (ˈʌɡli) hɛd/
UK /rɪər ɪts (ˈʌɡli) hɛd/

1.
rifare capolino, riapparire
if an unpleasant situation or problem rears its head, it appears or occurs, especially after being hidden or dormant for a period
:
•
The old rivalry between the two teams began to rear its ugly head again.
La vecchia rivalità tra le due squadre ha iniziato a rifare capolino.
•
Whenever we discuss money, his true colors rear their ugly head.
Ogni volta che discutiamo di soldi, la sua vera natura fa capolino.