nipple soreness in men could be related to medicatons you may be taking. since i do not know your medical history this is something that should be discussed with your doctor. as far as the black/brown spots are concerned this will require a hands-on visual examination. there is really no way to blindly make an assumption about the nature of these spots over the internet.
i am a 57 y. o. male with nipple soreness and asymetrical black/dark brown coloring (spots) on the aeriolas bilaterally.