Can anyone help I’d the black marks on my Hoya PLEASE

Got home yesterday and did my usual rounds of my plants to discover one of my Hoyas (Australis) a little odd.
She has black spots/marks on a few of her leaves.
Much appreciated if someone can help identify what is wrong and how I can treat her. I haven’t had her long on inspection of her soil I found a couple of wee mushrooms and the soil feels compacted.
Thanks in advance (worried plant Mumma here)

I have isolated her from my other plants

This message was edited Jan 28, 2021 12:50 PM

I’m not sure what that is, does rub off or seem to be inside the leaf? I’d remove the leaf, for sure. And repot with a looser soil mix, maybe 1/3 potting soil, 1/3 orchid bark, 1/3 perlite or vermiculite.

If it’s inside the leaf, could be some sort of disease, but I’m no expert on these things.

This message was edited Jul 28, 2021 1:02 PM