Sunless tanning lotion stained skin on my pits

I used the Banana boat sunless tanning lotion once a week for about 2 months. I now notice that my armpits are discolored a little and i haven't used that stuff in over a month. What the hell?
It's like the very center of my pits are white, but the part around it is darker than the rest of my body.
Did i stain my freakin skin? How long does this stuff really take to wear off?
Anybody else have this long lasting effect?
I have been shaving my pits and exfoliating them to help sluff off the old skin faster.
I feel like an idiot. Surely i can't be the only one. Right?

bump

it will wear off, it takes 28 days for you to "shed" the layer of the dermis.The reason I figure it is your dermis, and not your epidermis is cuz your epidermis wears off faster. I think the dye in the lotion got there. No worries it will go away. Give it another month

those things are utter waste of cash. even the good ones leave funny orange stains on my skin