Abstract: A wound dressing apparatus includes a patient interface configured to attach to an area of skin on a patient and extend around a wound on the patient. An access port extends from the patient interface and includes an aperture in the patient interface configured to provide access to the wound. An attachment structure extends about and out from an outer boundary of the access port. An access cap is configured to be removably attached to the attachment structure to provide an occlusive seal over the wound when attached to the attachment structure. A method of treatment utilizing the wound dressing apparatus includes attaching the patient interface to the area of skin on the patient extending around the wound of the patient. The access cap is removed from the attachment structure to relieve pressure from the wound. A treatment device is attached to the attachment structure of the wound dressing apparatus.