General consensus in the past (see question below yours on same page) is that it is commonly cheaper to replace than fix, particularly when you consider the $200+ shipping cost to return it to the factory for a flat-rate replacement or about $70 for a TV repair shop to lookk at it and tell you the screen unit needs replacing for $200-300 - when a new TV costs about $200-300 in the first place, depending on brand. However, for a 56" TV worth $2000-2500 new, that makes a difference, and the screen might not be about 80% of the cost of a new TV as with smaller screens.
There have been a lot of complaints about LED/LCD screens being overly sensitive to touch damage, so you might google your particular make and model number with the word complaints added on to the search phrase, and see if there is a recall or replacement program or class action suit. There have been a number of manufacturers doing a flat-rate wholesale cost replacement for this issue to avoid having a class action suit or recall, so you might get one from them cheaper than new, or a customer satisfaction rebate or coupon to reduce the cost - try out your customer service complaint capabilities.
If that does not work, call your local Tv repair shop and see what they say - because it is growing that sounds like a delamination in the screen rather than a one-time damage due to a pointed object, so it might well be covered by warranty, or Samsumg might replace it regardless as a factory defect.