Some causes of swelling in the child's legs include:
• Abscess
• Infection
• Kidney illness
• Warts
• Hyperkeratosis
• Calluses
• Fish eye
• Malignancy
It is difficult to determine the cause of your child's complaints without checking. Therefore, I recommend to do a check with a pediatrician, so that further examination and appropriate treatment can be given.
Some tips you can do:
•Cold compress on swollen feet
• Avoid pressing or massaging the lump
• Avoid using narrow shoes
• Enough rest
• Apply balanced daily nutrition patterns
So the answer from me, hopefully help