The present invention relates to a wound dressing including an outer layer of air-impermeable material and means for attaching the dressing to the skin surrounding a wound, a pre-compressed body of resilient material, said body creating a sub-pressure after attaching the dressing to a wound. According to the invention the pre-compressed body is enclosed in a casing 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.
