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I added armature to a TV model and everything was fine, but now when I bend its foot, the side of the TV bumps out.

Any idea what this could be?

Very new to Blender, but have been searching videos and posts, but no answer found yet.

Much appreciated.

Views with and without the armature. Circled part is the issue, the arrow pointing to the foot is just to show it's in a pose.

View without armature

View without armature

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It looks like a Weight Paint issue. Sometimes weights can be applied accidentally and even a .01 influence will affect the mesh. There are two ways to check for that.

A) In Edit mode, scroll down the Properties panel on the 3D window (right panel, press N if hidden). Click on the vertices where the bump is and you will see a section called Vertex Weights". There you can see what bones are affecting the selected vertex. Press X to remove unwanted influences and fix the remaining weights.

B) In Weight Paint mode, go to the Options tab, find "Show Zero Weights" and press the Active button. The blue mesh now turns black and you are able to see if bones have an influence of less than .1. Use the Subtract brush to paint them out and then go to Tools>Weight Tools>Clean

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