Black spot or dust on rear cam

Hello first of all im sorry for my poor english. I need help on my note 4 rear cam. I often use my camera but recently i tried taking a picture and i saw a dust or black spot on my rear cam. I tried taking out the lens but there is still a black spot or dust. Please help

http://i.imgur.com/o6wkEKD.jpg

http://i.imgur.com/9mFYNgG.jpg