First time trying this product

I have suffered from a bad back and muscle aches for some time now and have always relied on painkillers and hot baths etc which helps for a while. I was recommended better you magnesium oil by a friend and have been using it for a few days so far. It does seem to be working but beware of the sting, if you have any wee spots or scratches on you it can be quite painful for the first few minutes after applying it so maybe not recommended for anyone with a skin condition such as Eczema.