I tried to find some data - best I could come up with at this...

I tried to find some data - best I could come up with at this stage is below - the first article gives some numbers although they are obviously modelled with assumptions. Still, it suggests the Japan market has the potential to be USD67m by 2025 - which would be 5% of the global market. China seems to be a much bigger addressable market at about 20% of the global market.


https://www.marketresearch.com/Global-Industry-Analysts-v1039/Burn-Care-12667091/
Burn Care

Burn Care market worldwide is projected to grow by US$994 Million, driven by a compounded growth of 6.5%. Advanced Burn Care, one of the segments analyzed and sized in this study, displays the potential to grow at over 6.4%. The shifting dynamics supporting this growth makes it critical for businesses in this space to keep abreast of the changing pulse of the market. Poised to reach over US$1.3 Billion by the year 2025, Advanced Burn Care will bring in healthy gains adding significant momentum to global growth.

Representing the developed world, the United States will maintain a 5.5% growth momentum. Within Europe, which continues to remain an important element in the world economy, Germany will add over US$35 Million to the region's size and clout in the next 5 to 6 years. Over US$30.2 Million worth of projected demand in the region will come from Rest of Europe markets. In Japan, Advanced Burn Care will reach a market size of US$67 Million by the close of the analysis period. As the world’s second largest economy and the new game changer in global markets, China exhibits the potential to grow at 9.6% over the next couple of years and add approximately US$270.9 Million in terms of addressable opportunity for the picking by aspiring businesses and their astute leaders. Presented in visually rich graphics are these and many more need-to-know quantitative data important in ensuring quality of strategy decisions, be it entry into new markets or allocation of resources within a portfolio. Several macroeconomic factors and internal market forces will shape growth and development of demand patterns in emerging countries in Asia-Pacific, Latin America and the Middle East. All research viewpoints presented are based on validated engagements from influencers in the market, whose opinions supersede all other research methodologies.


ref: https://idataresearch.com/product/wound-care-market-japan/

In 2015, the Japanese market for wound care was valued at nearly $1.4 billion, and it will continue to increase over the forecast period. Please note that the market estimates in this report have shifted compared to iData’s previous Japanese wound and tissue management report due to major changes in the currency exchange rate between the U.S. dollar and the Japanese Yen.

In 2015, the combined market for wound care in Japan increased over 2014. Most of the market segments are well established, while other areas are still developing and growing in awareness across Japan. In 2015, the Japanese market for negative pressure wound therapy (NPWT) experienced the highest growth over the previous year. NPWT was approved for the Japanese market in November 2009, making it a new type of wound treatment. In addition, NPWT is an expensive form of wound treatment, resulting in greater initial growth.

The wound closure market showed the second highest growth rate in 2015. Wound closure devices represented the largest segment and are still growing steadily. The market consists of both less expensive products and costlier devices. An increasing number of laparoscopic procedures has resulted in growing demand for the premium-priced endoscopic staplers, which has significantly contributed to the high growth rate in 2015. The advanced dressings market, including moist dressings, antimicrobial dressings and interactive dressings, the interactive dressings and silver dressings segments showing greater growth potential in the future.

ref: https://www.marketsandmarkets.com/Market-Reports/burn-care-market-247121470.html
Burn Care Market by Product (Advanced (Alginate, Collagen, Hydrocolloid, Hydrogel), Biologics, Traditional), Depth (Minor, Partial-thickness, Full-thickness Burn), End-Users (Hospitals (Inpatient, Outpatient), Physician Clinics, Homecare)-Forecast to 2021

The global market is expected to reach USD 2.33 Billion by 2021 from USD 1.68 Billion in 2016, at a CAGR of 6.8% from 2016 to 2021. In this report, the global market has been broadly classified on the basis of product, depth of burn, end user, and region.

On the basis of product, the market is segmented into advanced burn care, biologics, traditional burn care, and other burn care products. The advanced burn care products segment is expected to account for the largest share of the global market in 2016. The advanced care products segment is further classified into alginate dressings, collagen dressings, hydrogel dressings, hydrocolloid dressings, wound contact layers, film dressings, and foam dressings. However, the biologics segment is projected to witness the highest growth rate in the market.

On the basis of depth of burn, the burn care market is segmented into minor, partial-thickness, and full-thickness burns. The partial-thickness burns segment is expected to account for the largest share of the market in 2016, owing to the increasing usage of advanced dressings and biologics like skin grafts and substitutes.

On the basis of end users, the burn care market is segmented into hospitals, physician clinics, home care, and other end users. The hospitals segment is expected to account for the largest share of the global market in 2016. Factors such as increasing awareness of burn care and rising incidence of burn injuries are driving market growth in this segment.
Geographically, the burn care market is dominated by North America, followed by Europe, Asia, and the Rest of the World (RoW). Growth in the North American segment is primarily driven by the increasing demand for biologics like skin grafts and its substitutes and high usage of advanced dressings in the U.S.