Help with possible fugus or pests

[Ankerite]

Hello all

I've recently noticed orange spots on my astrophytum seedlings and I am unsure if it is a fungal infection or a infestation (red spider mites?). I just applied a contact and systemic pesticide to the seedlings incase it is an infestation but I want to make sure that it is not a fungal infection either

image1(1).jpeg (85.87 KiB) Viewed 2974 times

The one on the right has a large patch on the base of the stem

image0(1).jpeg (104.1 KiB) Viewed 2974 times

The one on the right in this image seems to have quite a bit of damage

Thanks