Last week I had a really bad tummy attack, and as I normally do when I get bad tummy pains, I use a hot water bottle.( I have really bad IBS, and also this attack showed little tiny grains in the gall bladder)This time, the pains were really bad, and I used the hot water bottle consistently for two days.I put the bottle when it is bearable( and not too hot!) directly on the tummy without its cover, or I lie on it as this is the only thing to ease the pain.Problem is, I still 1 week later have little marks on my tummy from the water bottle, and I think that I have caused permanent marks!The marks have never stayed before, after using the bottle with period or IBS pain.They are under the surface of the skin, and there is noblistering or anything on the top. Has anyone else used a bottle, and got marks which have gone?