The area you have mentioned is always about two tones darker than the other body parts. If your inner thighs are very dark, it might be because of extra fat or it might be genetic.
If you have fat or loose skin on your inner thighs near bikini area, it will get lighter if you loose weight or massage frequently there.
If you use hair removal cream or razor on pubic area, it makes hair thick and skin appears dark.
If your skin on that area is damaged, apply coconut oil to soothe it or if you have ingrown hair, use soap with little salicilic acid on that area.
If the problem is major and you are ready for a treatment, you may go for laser depigmentation.
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