How sure are we that following the treatment the condition didn't return? Or there wasn't a secondary infection? From wikipedia:
Some bacteria, such as Staphylococcus aureus, Streptococcus pyogenes,[4] and Clostridium perfringens,[5] produce hyaluronidase as a means of using hyaluronan [hyaluronic acid] as a carbon source. It is often speculated that Streptococcus and Staphylococcus pathogens use hyaluronidase as a virulence factor to destroy the polysaccharide that holds animal cells together, making it easier for the pathogen to spread through the tissues of the host organism, but no valid experimental data are available to support this hypothesis.