You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is A characteristic feature of Still's disease - and explain in detail?
Stills disease is a variant of rheumatoid commonly occurring in adults in 20's and 30's.
Patients characteristics clinical features are:


High spiking fever often up to 40°C.
Sore throat
Evanescent salmon coloured non pruritic rash, seen on chest & abdomen
Lymphadenopathy
Pericardial effusion
Wrist joint involvement


Chances are that you might confuse it with Felty's syndrome so I am giving the important features of both these conditions together