Ankle pain might be due to infection from pneumonia. However, as there is no redness and swelling, it is unlikely. So wait until things become more clear.
Other rare possible causes rheumatic fever, rheumatoid arthritis
Inquire about injury or fall also
Next Steps
Blood CBC,
CRP, ASO Titre and XRay
Health Tips
for pain and fever, paracetamol or combination of paracetamol with ibuprofen