A kit of parts for use in treatment of tissue by a contained plasma and/or plasma products, comprising: a plasma generating device for use with a membrane dressing attached to tissue requiring treatment, comprising: a first cavity with a first opening at one end the first cavity being formed between a high voltage electrode comprising a dielectric barrier material and a grounded electrode such that, in use, a dielectric barrier discharge between the high voltage electrode and the grounded electrode ionizes a feed gas to produce at the first opening a non-thermal plasma and plasma products; and the membrane dressing for covering the tissue requiring treatment, the membrane dressing comprising: a sheet of impermeable material configured for forming a plasma containment compartment adjacent tissue, such that a tissue-facing inner surface of the impermeable material defines a sealed environment which prevents plasma and/or plasma products from escaping to a surrounding environment; and one or more input connectors and one or more connector tubes configured to admit plasma and/or plasma products through the membrane dressing; wherein the plasma generating device and the one or more input connectors of the membrane dressing are configured to allow the plasma generating device and the one or more input connectors to be directly coupled or indirectly coupled through a connector tube to allow fluid communication of the plasma and/or plasma products produced at the first opening of the first cavity of the plasma generating device through the membrane dressing to, in use, allow conduction of the produced plasma and/or plasma products into the membrane dressing. a plasma generating device for use with a membrane dressing attached to tissue requiring treatment, comprising: a first cavity with a first opening at one end the first cavity being formed between a high voltage electrode comprising a dielectric barrier material and a grounded electrode such that, in use, a dielectric barrier discharge between the high voltage electrode and the grounded electrode ionizes a feed gas to produce at the first opening a non-thermal plasma and plasma products; and the membrane dressing for covering the tissue requiring treatment, the membrane dressing comprising: a sheet of impermeable material configured for forming a plasma containment compartment adjacent tissue, such that a tissue-facing inner surface of the impermeable material defines a sealed environment which prevents plasma and/or plasma products from escaping to a surrounding environment; and one or more input connectors and one or more connector tubes configured to admit plasma and/or plasma products through the membrane dressing; a first cavity with a first opening at one end the first cavity being formed between a high voltage electrode comprising a dielectric barrier material and a grounded electrode such that, in use, a dielectric barrier discharge between the high voltage electrode and the grounded electrode ionizes a feed gas to produce at the first opening a non-thermal plasma and plasma products; and the membrane dressing for covering the tissue requiring treatment, the membrane dressing comprising: a sheet of impermeable material configured for forming a plasma containment compartment adjacent tissue, such that a tissue-facing inner surface of the impermeable material defines a sealed environment which prevents plasma and/or plasma products from escaping to a surrounding environment; and one or more input connectors and one or more connector tubes configured to admit plasma and/or plasma products through the membrane dressing; a sheet of impermeable material configured for forming a plasma containment compartment adjacent tissue, such that a tissue-facing inner surface of the impermeable material defines a sealed environment which prevents plasma and/or plasma products from escaping to a surrounding environment; and one or more input connectors and one or more connector tubes configured to admit plasma and/or plasma products through the membrane dressing; wherein the plasma generating device and the one or more input connectors of the membrane dressing are configured to allow the plasma generating device and the one or more input connectors to be directly coupled or indirectly coupled through a connector tube to allow fluid communication of the plasma and/or plasma products produced at the first opening of the first cavity of the plasma generating device through the membrane dressing to, in use, allow conduction of the produced plasma and/or plasma products into the membrane dressing.