is there any way still to get rid of them using Sculptris or ZBrush
The zBrush dynamesh should get rid of these errors at the cost of removing details you sculpted, just keep reducing the size of the grid.
Mistakes like these even happen to professionals, we have a rule: if you can't fix it in fifteen minutes scrap and start again.
There is no point to clinging to a bad model and when you do it a second time it will look even better than the first time.
With legs, keep them separate so that you don't have to remake all of them, you can just copy and paste a good leg. It also means that you won't have to scrap the whole model when you make a mistake; merge it all when you start detailing.