As your husband has an armpit lump, I presume chest X-Ray has been done to rule out the possibility of tuberculosis
.First an antibiotic course will be needed for him. If there is no response to antibiotic then further investigation may be required to rule out tuberculosis.
Hyperaeration in chest X ray
suggest some kind of obstructive airway disease
I would suggest you to consult a general physician for proper evaluation and treatment.