Do you have any advice about this problem?

A friend of mine who is a bit overweight. He has two big black marks between his legs, probably caused by his size and negligence. He was't really aware of that, but anyway I told him to dry the skin very well after the shower and maybe use one scab sponge for dead to remove a dead skin, what do you think about it? is it ok? Do you know what to do? or any cream he can use? i would really like to help him get rid out of this horrible marks. any suggestion? thanks to all xDo you have any advice about this problem?
The marks are probably from his legs staying damp most of the time. They probably sweat more than most and they probably don't get completely dry after each shower because of his excessive weight. He needs to lose weight. But making sure they stay dry and putting baby powder on them periodically might help.Do you have any advice about this problem?
Your friend should wash his legs with soap and water, then apply lotion after they are clean and dry. These marks are probably from friction and unless he loses the weight they probably won't go away. There are special creams on the market that can be used to help reduce the friction. He can also use powder. Hope it helps.