Thanks for your question on Healthcare Magic.
I can understand your concern.
Bronchitis is inflammation of airways.
It can also cause infection and inflammation in lung parenchyma.
You are also too young (20 years) for
lung cancer.
So possibility of inflammatory nodule is more likely in your case.
So no need to worry much.
Start treatment for bronchitis.
Once your bronchitis is cured, this nodule will mostly disappear.
Get done repeat CT thorax once bronchitis is cured.
If nodule is decreasing then no need to worry.
But if nodule is increasing in size then you will need
biopsy to confirm the diagnosis.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.