This is such a testament to why we always perform a skin test for any new client for hair colour. (existing clients new to colouring are also tested) We know that it can be inconvenient to pop in 48 hours before your colour appointment, but really - as in this example here - it can save your life...
Professional hair salons will always insist that you have a skin test before any colour is applied on scalp, and this is why!

Rosie howe - stylist