I owe you an update.
the whole problem is GONE. Pretty crazy.
Ringo is all well and shiny. I pulled the liquid out a second time after 3-4 weeks myself (fresh sterile needle for sure) and after that it never build up again.
the skin at his neck is also normal again and is not strechted anymore.
Wow, been going through some stuff with those guys, but they all are healthy and shiny and most of all seem to be very happy.

Toad Love to everyone <3