[Assessment of external methods of traditional Chinese medicine in patients with chronic ulcer of the lower extremities: study protocol of a multicenter, randomized, parallel-group, prospective trial].

Background: Chronic ulcer of the lower extremities amounts for a grave and serious problem for public health. Western medicine focuses on controlling infection, improving blood circulation, surgical debridement, skin grafting, etc, but there are bottlenecks in the treatment. Traditional Chinese medicine (TCM) has a long history and a legacy of sound clinical efficacy in this area.