If you could post a picture that would be great! I am fairly sure thats normal and its just the feathers growing in, it also might be a sign of a male if its feathering in slowly!
Its just the feathers growing in, no need to worry ^^
The feathers will never look "Normal" so to say since its a silkie, but Roo's grow feathers a slower than hens, but for silkies, my girls began looking full feathered at about 8 months. Or at least there were no more little plastic feather pieces left XD