What alternatives can I use to lighten my dark inner thighs if I'm allergic to hydroquinone? (Photo)

I have dark skin (olive) and have dark inner thighs from years of friction I assume (picture included). I was overweight, but now my BMI is a healthy range. Unfortunately, I'm allergic to hydroquinone. I've tried Kojic acid soap for about 2 months with no improvement. I've been using manual exfoliation and 8% AHA gel but I haven't seen any improvement so far. What are my options? I prefer not to undergo any laser treatments because I'm worried about hyperpigmentation.