What is this on the Plastron?

[shellysmom]

I just got this little redfoot shipped from up north to foster for a couple days before it goes to its forever home in SW Florida. I noticed the plastron looks a little strange. At first I thought it was just coloring from whatever substrate it was on before, but after looking again, it seems a little more involved than that. Does anyone know what it is?

 

[yagyujubei]

To me, it looks like a fungal infection.

 

[shellysmom]

To me, it looks like a fungal infection.

Ugh, that's what I was afraid of.

 

[ALDABRAMAN]

looks like a fungal infection.

I agree!