Child complains for a second day that a calf on one leg hurts and now also an ankle, limping for 2 days no swelling, redness and not hot. What is it?

SIMPLE TO SERIOUS. Does the child feel sick? Fever? Calf bigger than other side? It could be something as simple as a muscle strain/sprain, to an infection, leg fracture, or something very serious but also very rare in children; a DVT. This should be checked by a pediatrician.