Homeopathy is not risk-free. It can harm people. It does this by encouraging them to stop or avoid taking proper medicine in favour of bullshit.
If you're basically well and are just a bit worried about a minor rash then, sure, go along to your friendly homeopath and get charged a lot to have someone in a white coat go "There, there" at you and sell you some sugar pills. There are cheaper ways of achieving the placebo effect but what the hell.
Many homeopathic doctors claim that their sugar pills can prevent malaria (as Simon Singh reported). How dangerous is that?
Even worse, people take this bullshit for cancer because they're told that it will cure them without the nasty side-effects caused by chemo- or radio-therapy. And they die as a result.
Moreover, encouraging people to ignore science in favour of woo-woo bollocks diminishes society as a whole. Steve Jobs would likely still be alive if he'd had his pancreatic cancer treated promptly rather with wasting months on special diets, acupuncture and herbal remedies.
Yes, medical science makes mistakes as do doctors. But there is no correlation between "Medical science makes mistakes" and "Therefore we should ignore science entirely".
As was written in the Telegraph a while back, if we can prosecute someone for selling fake bomb detectors, how are homeopaths allowed to stay in business?