Skin lesions, such as chronic ulcers and burns, represent a serious public health problem due to high government costs, and scarce successful conservative treatments.There is a growing scientific literature on the use of electrotherapy in the process of wound healing, but in return there is a dearth of scientific studies on the use of various types of currents and the different parameters in the proposed treatments.

This project proposes the use of polarized currents to increase the speed of healing in chronic ulcers and donor sites in burn patients. Will be included 30 patients with chronic ulcers and 30 burn patients undergoing skin graft surgery, will be randomized into control and treated groups. For the ulcer chronic group treatment will be with 50 minutes high voltage and 10 minutes diadynamica current and the burn group only 50 minutes high voltage current.

Inclusion Criteria:

• all patients admitted to the rehabilitation center of Clinical Hospital with chronic ulcer, Faculty of Medicine of Ribeirão Preto / USP, in the period between january 2010 and december 2011
• all patients admitted to the Burns Unit of Clinical Hospital, Faculty of Medicine of Ribeirão Preto / USP, in the period between march 2011 and december 2012

Exclusion Criteria:

• Infection
• weight below 16kg