Seems more likely to be infectious, close followup would be advisable.
Watch for fever, cough, chest fullness, pain.
Weight loss.
Next Steps
Shall try for antibiotics and also some breathing exercises.
Health Tips
On top of that start a high protein diet. 6 eggs a day shall be ideal. If you're non-vegetarian, if you're vegetarian please try paneer and soyabeen.
Followup scans will be useful.