DASH PAD

If you keep it , and its not a hard spot under it but pushes down , use a heat gun dont burn and then ice and it will shrink , may even help with the 2nd area ,,heat expands and ice shrinks upholstery among many things ,,if its a hard spot may not help ,
Yeah, feels and looks like staples maybe... Not sure if staples are used, but that's what it looks like... Uniform at both ends.