For all those who have prolonged reactions to leech bites, try this. ---HONEY--- No Frills will do. For the record, I used Yellow Box no name honey.
Just put a small amount on a bandaid and place it over the bite. Keep on for about 48 hours (changing as required).
I have always suffered badly from leech bites with them remaining itchy and raised for many days and sometimes weeks. Two weeks ago I had a very angry leech bite. I wanted to scratch my ankle off it was that bad. As I had just successfully mended an infected cut with honey and bandaid, I thought I would give it a try. It actually began to sting a little after 5 minutes, just for a few seconds, then nothing else. After 48 hours I took the bandaid off to just a small wound. No infection, no thickening of skin etc. Today the bite location is barely visible.
I am about to add a small portion of honey, in an air tight jar, to the first aid kit for when I do my next leechy bushwalk.