Thanks for the query to H.C.M. Forum. Cellulitis
means infection just below skin but outside bone ( in this case).
Still pus is coming , so this is not a good thing. Bone infection
are the reasons of pus.
Please consult orthopaedician and get his opinion.
Get an X ray
of injured bone to find out the reason of pus , whether it is from bone or just below skin.