I can't tell from the picture, but could it be ringworm? If so, grate an onion and dab the juice on it twice a day and in a few days, it will be gone. Onion juice works for people ringworm too.
You mentioned that it was there last spring, could there be a plant that is giving your goat a reaction? Maybe something in your pasture is blooming and it is irritating her skin.
I'm not a goat keeper, but there are quite a few goat experts here and they will be along to help you shortly!
You say this happens in the springtime? Do you have blackberries, raspberries, multifora roses, or anything that has thorns in your pastures that would be greening up right now?
we have a lot of greenbrier that would be the only thing with thorns in the pasture they are currently in. idk when it starts to green up. in our other pasture we do have some blackberries but they have not been out there.
My suspicion is that your goat is sticking their nose into something that is causing an irritation to crop up. I would try a week course of Benedryl to see if it clears up.
Benedryl - Allergies - Note: I only give it one time a day in the morning though personally.
all of my Does have them except for the two that were born last year and were in a different pen till recently they also have some on the part of there nose that don't have hair and they are little round scabs. dose that make a difference? Oh, i just remembered the hay they have been eating has some German thistles and blackberries in it.
see the lighter spots that is what they look like when the scab falls off.