Respected user, hi I evaluated your query thoroughly.
* Differential diagnosis include bacterial or viral infection of respiratory tract
with low immunity leading to super added infections like bladder
infection, ring worms on legs .
Possibility of micro metastasis must be ruled out in form of relapse.
* Thorough clinical evaluations along with necessary data in form of
Laboratory , Imaging like
bronchoscopy , CT /
MRI ,Pulmonary lavage for
histo pathology according to the clinician judgement .
Hope this helps you .
Welcome for any further assistance .
Thanks for using Healthcaremagic.com & reviewing my answer thoroughly.
Wishing you fine recovery from the same.
Regards dear take care.