As it gets hotter, I am worried about skin discoloration.

It seems to be getting hot rapidly, and now that I'm switching from long sleeves to shorter clothes, I'm worried about skin discoloration.

I'm especially worried about my armpits and groin area.

Is there an effective treatment for this area? I've tried creams before, but I don't think they helped much.

Maybe it's because it's a friction-prone area, but the color looks dark even though I haven't gained weight, so I feel embarrassed to wear clothes that expose it. Has anyone had groin whitening treatment?