I had a client that got a tattoo above his knee going towards the upper thigh. The lining went well, but when I began to shade around his knee area there was resistance. I used a 7 Mag Shader needle, but it was almost like I couldn't drag the needle through the skin. I had to end up making this dotted motion to fill in the empty spaces. The upper thigh was fine, but when I got to that thick patch of skin it almost seemed IMPOSSIBLE to get the needle moving. Any suggestions?