A flexible occlusive or semi-occlusive dressing. The dressing has a thickness of less than 100 ìm, and is of adequate shape and size for occlusion of a fingernail or toenail. The dressing includes a support layer in polymer-based plastic film at least partly coated with an adhesive layer. The dressing has an up-turned T-shape comprising a central part (1) intended to cover the nail, two identical side branches (2) intended to be folded back under the finger on each side of the nail representing the short branches of the T and a tab (3) intended to be folded back longitudinally under the finger positioned in the continuity of the nail before its folding and representing the long branch of the T.
