my son having rashes on both hands why now it's coming in leg too??here I attached photo pls check and help me

A. this appears to be some type of allergy. anti allergic medicines has to be given to the child and you have to find the cause of allergyz do not give any type of food and do not apply any type of powder or lotion which might aggravate this allergy kindly give plenty of fluids to the child and then meet your doctor for examinationx