Leopard gecko little brown underneath

[snip3d_out]

my leopard gecko is a little brown underneath, i was wondering if that is a bit burned or is it normal?

 

[2bacop]

a picture would be helpful because sometimes the brown means impaction, was it ever kept on sand?

 

[snip3d_out]

no.. its just like on his scales

 

[Retribution Reptiles]

Try taking a wet q-tip and rubbing it on the area, see if anything comes off. It might have laid in its own feces.