My daughter has red spots and red lines on the bottom of her feet. Recently, she has worn high heels and has done lots of dancing. The spots are not painful. She does have some blisters from weaing the heels, but the lines do not seem to come from the blisters.
Millie - you want to make sure your daughter's feet don't become infected. I would soak them with epsom salts a few times a day to help with the inflammation. That should soothe her feet. Also, watch those red lines and make sure they don't start moving up her legs. Call the doctor immediately if that happens.