There is no scientific evidence that the risk of developing breast cancer increases if you use antiperspirants. Indeed, there is strong evidence to show that antiperspirants are safe and do not cause health problems. A recent and comprehensive clinical study found no links between the two - a position that is backed up by cancer specialists, charities, and governmental bodies across the world.
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When we are hot our skin goes red because our blood flows near to the surface of the skin to increase heat loss.