Why would you use doxycycline to treat swollen lymph nodes?

Personally I would not understand why they would use doxy of all things to treat swollen lymph nodes of the neck usually that suggests a viral and is something that has to fight itself out however if there is an infection the best treatment for the lymph nodes is usually a myacin (i.e. Clindomyacin, Erythromyacin, Azithromyacin(Zithromax), or Even if you can tolerate them Ampicillin, Penicillin, Amoxicillin these all are much more effective then doxycycline. Doxycycline is usually used for respiratory infections, pelvic inflammatory diseases, and peridontal disease. Hope this answer is helpful