Women in US Nurses’ Health Study followed over 36 years to examine associations between personal use of permanent hair dyes and cancer risk and mortality.
Dr. Lauren Swann said she first became aware of the issue through feedback from her patients, but ran into similar problems herself when she tried scheduling her 18-month-old son for some shots.
While the condition is rare, Dr. Rae Yeung, a professor of pediatrics and immunology at the University of Toronto and SickKids hospital said parents should know what symptoms to look out for.