What is this miracle stuff made of

I was given some on my arrival in Smugland last year

I used it while there to ward of bites

it worked a treat

Anyhoo three days ago New Mr B was complaining about this bite he has had on his leg he has had for three years and it will not heel infact has got bigger.
I put some Golden Cup on it once a day over two days

It has heeled and almost gone.
Most impressed
