Anything that is to be published needs to be looked at carefully first, before being published. If it is a picture, of a girl, with just baring the back, then the picture tells a lot, even if doesn’t show them all. This is a picture I just found over thikthak.com. They have posted some semi-nude picture of a girl named Bizita. And in the attached pictures of hers you can see the dark patches in her back.
Ok.. lesson number 101: “get rid of all the skin patches, marks, unwanted hairs” from a so called models before publishing them, specially if they are nude or semi-nude (in this case). That is why “God made Photoshop”. Needs to brush it up, man. They are just humiliating themselves.