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...