Wondering If My Budgies Cere Is Okay!

Hello! 

I have had my boy for nearly a year and the past few months his cere hasn't been quite right. 

At first it was only a small amount, but it has gotten worse. He eats well, mainly seeds, but i feed him plenty of fruits, veg and greens! (Blueberries, carrots, mint, lettuce, parsley, apple etc) He is acting as normal as ever too, very happy and loving. I let him out a few times a week to stretch his wings and i keep his cage clean too, so I'm unsure where this could have come from. 

I have attached some photos for reference, to me it looks dry? maybe from the odd whether, but i just thought i would reach out for some advice! I may take him to a vet soon to get it checked out..