Big toe toenail is buckling, like a rug pushed against a wall, 3 mm high dome?

Answer for Help.: Down the middle or side to side. It can make a difference. History of trauma? Color? Pain? How long?

Injured nail: nails can buckle when they are injured; the dome like area us where the nail has separated from the nail bed. It can be removed by a Podiatrist who can evaluate the nail if there is a fungus or other skin pathologies present.