I wish you'd all told me about Tiger Balm before I went to New Zealand. I have a nasty reaction to sand fly bites. This time, my left foot was badly bitten almost the day I arrived and the swelling extended from my toes to my knee. Naturally, I tried not to scratch but inevitably did so during the night when asleep (and sometimes when awake as the itching was intolerable). A $100 visit to the doctor resulted in a diagnosis of cellulitis, a massive dose of antibiotics, antihistamines and something else that I've now forgotten and the threat of hospitalisation if the swelling didn't start to decrease within 24 hours. The whole thing took a fortnight to clear up.
The doctor reckons that when I move to NZ, my body will get used to sand fly bites and I will have steadily less alarming responses. It is not a process that I anticipate with pleasure. However, I shall stock up on Tiger Balm.