Hrrmmm... okay. There's no polite way to ask this, so I'll just ask. Is there any chance the change has more to do with friction from your thighs rubbing together? That sort of chafing can easily result in darkened skin and rough patches. This can come from weight gain, a change in your gait following pregnancy, or even something as prosaic as changing from skirts and dresses to jeans and shorts.
Again, it may be that I am totally off base here and I don't mean to offend. But when I hear "dark rough patches on the insides of thighs", chafing is the culprit that leaps to mind.
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