Coconut Oil: Coconut oil can help moisturize and lighten the skin. Apply a small amount of coconut oil to your inner thighs and massage gently.

Cucumber: Cucumber has a cooling and skin-lightening effect. Mix the cucumber to make a paste and then apply it on the darkened area. Leave it on for 20 minutes and then wash it off.

Oatmeal Scrub: Make a gentle scrub by mixing oatmeal with yogurt. Gently massage the mixture on the inner part of the thighs in circular motions, then rinse it off.

Potatoes: Potatoes contain enzymes and vitamins that can help lighten dark areas. Rub a slice of potato on the inner part of the thighs or apply potato juice, leave it for a while and then rinse it off.

Papaya: Papaya contains natural enzymes that can help exfoliate and lighten the skin. Apply the mashed papaya on the inner thighs, leave it for 20 minutes, and then rinse it off.

Hydration and a healthy diet: Drinking plenty of water and eating a diet rich in antioxidants can help improve overall skin health, which may help lighten dark areas.

Wear loose-fitting clothing: Reduce chafing and irritation by wearing loose-fitting clothing to prevent further darkening of the inner thighs.

Sun protection: Protect the inner thighs from sun exposure by applying sunscreen when wearing shorts or skirts.

Remember that results from natural treatments can take time to show, and consistency is key. Additionally, be aware of any allergic reactions or irritation, and discontinue use if you experience any side effects. If you are concerned about the darkening of the inner part of your thighs, it is a good idea to consult a dermatologist for personal advice and recommendations.