I have excess skin around my knees that hang over in the back

This is really gross but I noticed an odor after scratching the back of my knees. I took a shower and paid close attention to wash that area very well. After drying off, I again noticed the odor. Please don't tell me this is bad hygiene - because I know that is not. I'm sure it has something to do with my obesity but I'm also wonder if it isn't rotting flesh. Anybody know what it could be and how to fix it (besides loosing weight) I'm afraid that maybe other people can smell it.

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