(Feeling a bit of mummy-fail at the moment).

I've been using the Cheeky Wipes system for about 3 months and at most keep about 25 wipes in the box with scented water.
But...
I've noticed that since having a heater on in the room, some wipes are getting black spots on them, which I assume is mould
We have still used these wipes (mostly without realising) and now DD has a few red blotches on the top/outside of her labia and on the bottom of her bottom! I'm not exactly sure what nappy rash looks like but I'm wondering if this could be a fungal infection??

Any experience?
How did you treat the rash?
And how did you treat the wipes?