The girl, aged 13, was stung on the left hand and helped from the water at Nai Thon after screams brought lifeguards running.
Oxygen was used to help the girl calm down. Experts advise that the best treatment for bluebottles - also known as the Portuguese Man o' War - is salt water, followed by warm water.
Vinegar is recommended with other types of jellyfish because it reduces toxicity. Bluebottles are sometimes in Phuket's waters at this time of year, but disappear before the November high season.
In another incident at Kamala beach, a tourist was hurt when he stood on a sharp discarded umbrella spike while running.