Five months ago, the singer broke down in tears on Good Morning America while discussing the physical toll the disease - a form of arthritis caused by ticks - had taken on her, reported Digital Spy.
Things are definitely looking up these days, according to a smiling picture Lavigne posted on Instagram.
The "Alice" singer also shared a look behind the scenes of one of her medical appointments.
Lavigne wrote to fans: "Overcoming Lyme Disease. Feels good to have my Dr. Smile and tell me how much progress I am making.
Lavigne subsequently returned to the stage in July, and has since teamed up with Taylor Swift for a duet and expressed a desire to transition to acting.