Hongkonger Susan Tam, 70, used to wake in the middle of the night, desperate for relief from an unbearable, relentless itch caused by her cancer medication.Tam, diagnosed with lung cancer a few months ago, tried applying regular moisturiser to soothe severe skin rashes, but in vain.She also used aqueous cream, a staple from her time working in a care home for the elderly, and even turned to hot water to numb the irritation, only to find it further inflamed her condition.A visit to a family...