The bulb element 37 may, for example, be fabricated from a material such as a flexible polyvinyl chloride or a silicone material. [0037] With reference to FIG. 1a, it will be seen that the enclosure 11 is being applied to the leg portion of the body 52 of a patient, such that, after a flange 13 is adhesively secured to the skin 53 (not shown) of a patient, the cover 30 is openable and re-closable