In extreme cases the burns need to be treated in hospital, and risk permanent nerve damage.
In the UK the National Society for the Prevention of Cruelty to Children (NSPCC) warn parents to keep an eye out for upcoming online trends that could put their children in danger.
Similar challenges in the past have caused deaths including the cinnamon challenge in the 2000s which can cause lungs to collapse, and ‘planking’ where daredevils fell to their deaths after attempting precarious locations to perform the stunt.