Fungus? or something else?

[lepetitmartien]

I'm wondering…

The last looks like something spreads inside, I'd cut largely.

I wonder if something has not taken the opportunity of the burns to enter. The first pic has what could be lines of progression, which could be fungal.

I'd look closely for any sign of something watery or smelly. A smell would be helpful.

Isolate and look closely…