S.H.
If it is indeed an infection... internally in the lymph nodes, to me... a topical ointment is not going to "cure" it... because it is an internal infection... and antibiotics are usually taken orally....either in pill form, or for babies, in liquid form.
I don't know what you mean by BCG vaccine. What is that abbreviation for???? Oh sorry it is the Tuberculosis vaccine. I didn't know they did this in the U.S.A.???? It is common in Europe.
So, as you describe it, there is more than 1 swollen lymph node? On either side of his groin or on the same side?
The thing is, without further diagnosis and a CONCLUSIVE idea of what it is....the Doctor is only speculating.
Or maybe its something else? A cyst? A hernia?
I would get another opinion.
All the best,
Susan