Why is deku's body covered in black except his right hand and his upper face :/ ??

dreams can be weird dude, but maybe it has to do with how much of OFA he is able to control and the more he can control the more he will be able to see in the dreams??? this is all just guessing though and is probably not even right (￣∇￣")

That is exactly what I thought ヾ(☆▽☆)