A device and method for treating an ingrown nail condition is provided. The device prevents a solution that is applied during a procedure from coming into contact with the surrounding skin and nail bed. The device includes a plastic tube that has a flap located at one end. An applicator is inserted through the tube to ensure direct application of a phenol or similar solution onto only a nail matrix. As a result, the phenol or similar solution is prevented from coming into contact with the surrounding skin and nail bed, thereby reducing post-operative healing time, post-operative infection and post-operative pain.