Problem with my ricordea

[red fang]

Hi,

I bought one pink ricordea yuma last week, and i notice that a part of this is getting brown.

Here is some pics of the problem:





I don't know if it is in relation to, but i think i hurt the foot of the ricordea when i was searching for a good place for it

Maybe a necrosis, or a kind of ringworm?

I already searched on the internet but i found nothing like that

Do you have any idea of what happen to my ricordea?

Thanks for your answer

ps: Sorry for my bad English, I'm Belgian