Fungus Plaster made for the topical treatment of fungal toenail and fingernail infection. The small disc contains urea, an organic chemical compound, which is the most effective substance against fungal infection, as it blocks its spreading. The 40% of Urea contained in the plaster acts by modifying the pH of the area subject to treatment, weakening the part of the diseased nail with the consequent selective detachment of such part and facilitating its cutting and, therefore, its removal.