The present invention relates to wound dressing (1) including an outer layer of air-impermeable material (4) and means (5) for attaching the dressing to the skin surrounding a wound, a pre-compressed body (2) of resilient material, said body creating a sub-pressure after attaching the dressing to a wound. According to the invention the pre-compressed body (2) is enclosed in a casing (3) of air-tight material, whereby at least a portion of said casing is made of a soluble material, which dissolves after contact with liquid exudate.
