so I have a arm model, and I baked a normal map for from a sculpt. However, when I apply this normal map in any program (Blender, Unreal, Unity) there are seams on it. (from the UVs). This is ugly and I'm not sure why its happening. Please help]1
If you are using cycles you probably forgot to switch your image texture node from color to non-color data. This will hide the seam significantly. Also creating a higher resolution normals map will help as well.
If seen this several times. In my experience it is due to weird uv mapping. Try to unwrap your model different. I find these edges occur when some connected faces are not connected in the uv map