Thank you for your response, I never thought of Benadryl.
Thank you it has not gone away so I think I will have to take her in.
Is she well in herself otherwise? Like she usually is?
It could be that she came in contact with some plant in the garden (?) and has had an allergic skin reaction. You could try Benadryl, and see if that helps at all. I'd say watch it to see how things go, and if it's not gone in a day or two, get her checked at the vet.
There's info. about safe dosage of Benadryl for dogs here:
http://dosemypet.com/dosage/for-dogs/benadryl/
My daughters English Bulldog gets similar wear and tear on her face when she sniffs or rubs the ground a lot playing with her toys.
But watch it for basic infection or spreading which could indicate a fungal infection. If so a trip to the vet is probably needed.
Hope she heals up soon!