A leading specialist on Victoria's outbreak of flesh-eating ulcers has accused the government of inaction amid an "exploding epidemic".

Associate Professor Daniel O'Brien said more funding was needed to answer crucial questions to stem the outbreak.

“It’s still getting worse. And we still have not got any [new] funding," he said.

The Department of Health and Human Services denies his claim, saying almost $800,000 in research money had been spent on the infection over the past decade, and more was coming.