I don't see anything too worry about. RF can get shell rot easily. They need high humidity but a dry top layer of substrate. I would keep an eye on what your seeing to be sure it doesn't turn into rot. If it does get worse looking you can put some athletes foot cream on it until it's gone.
From what I can see, it doesn't look like anything I'd worry about.
From what I can see, it doesn't look like anything I'd worry about.