Neon zero, that's what my mares nose looks like. Im not worrying to much as it seems like a common thing.
She's not showing any other symptoms and she's not acting any different from what she usualy does.
I think its just the pollen in the air that's causing her to have a bit of an allergy. The mucus does not smell or it has not changed in colour so I don't think its any need to call the vet, but I will be keeping a close eye on her.