Looks like natural patterning to me, also just a tip since your beardie will have lots of trouble shedding because of its morph I recommend getting a jar of coconut oil and rubbing that on him/her when shedding. You can also use aloe vera I believe on the skin.
I use this type for my reptiles during sheds. Usually only my tegu or BTS get it as the beardies shed easily, however with silkbacks (which is what yours is) they have a harder time shedding and often loose toes and tails because of stuck shed.