Skin Problems White on Ear

It looks like it to me. You can treat yourself, have a look through this link: https://www.guinealynx.info/fungus.html
Fungal infections can be contagious, so be careful. Wash your hands after handling and everything in the cage really well.

Ditto @ellisa. You can do it yourself -- read those links she gave you. Be aware that Nizoral shampoo is being taken off the market -- some places still have it, but when it's gone, it's gone. That link should give you some other possibilities for treatment.

I've bought a couple of creams from gorgeous guineas. It's only on her ear I've checked her body and the other guinea pig. Will the cream be ok to clear it up?

We have no idea whether the Gorgeous Guinea creams will clear it up, since we don't know what they are. Is there an ingredients list on them?

You need something that will tackle a fungus infection. Monistat, readily available at any pharmacy will do it. And there are other creams listed on that GL page.

Applied some daktarin cream today and did a huge clean out of their home using Beaphar disinfectant. If I keep applying the cream will this be ok as she is only 3 months old. Also a bit confused, is all fungal infection ringworm or are there different types of fungal infection on guinea pigs?

Yes, there are different strains of fungus.