** Shares of SkinBioTherapeutics SBTX.L crumble 39% to 7.5p , set for the biggest single-day pct drop since April 2020
** British skin-health co SBTX investigates former CEO Stuart Ashman & believes he misrepresented material financial information to board & auditors
** Adds, resulting restatement of 2025 accounts means fiscal 2026 results would be "significantly below" market expectations
** Alleges Ashman had misrepresented material information, which would require reversing about 770,000 pounds ($1.05 mln )in royalty income from fiscal 2025 accounts
** In 2025, stock fell ~15%
(Reporting by Ankita Bora in Bengaluru)
((Ankita.Bora@thomsonreuters.com))