1 month post-op. What is this hard ball inside my left nostril just under the columella? (photos)

It is possible that you are feeling a graft of cartilage or the end of your nasal septum. That said, you shouldn't concern yourself with it at this point in time.  It is way too early to scrutinize your nose from all angles as your nose will continue to change and evolve over many more months. Focus on taking good care of your mind and body. If over time the issue does not resolve then it can be addressed with a minor corrective procedure.  My best.

Hi and thank you for your question. It's too early to say and jump into conclusions. Postoperatively, after a rhinoplasty, can take up to a year to heal. Your nose is still swollen and it's a matter of waiting till the swelling goes down. I suggest you follow up with your doctor in a few months as indicated. 
All the best,
Dr. Gary Linkov

Great question!  At 1 month it is difficult to tell what is causing this, especially when the characteristics change during massage.  It could be something as simple as inflammation around a suture or something more complex but only time will tell.  Continue your followup appointment to see if it improves over time.
Best of luck and hope this information helps!
- Dr. Roger Tsai
Board Certified Plastic Surgeon

You need to have patience with your body as it begins to heal. The skin, bone and cartilage are all traumatized during surgery. Inflammation (swelling) is the normal response and will help your nose to heal and look beautiful in the end. Right now, concentrate on other things you like to do and let your nose and under eyes take the time to heal. It can take up a year for your final results. I hope this helps.
 

Dear amalkh90,
Thank you for your question. It is difficult to make an accurate assessment and recommendations based on photographs alone. I recommend you seek continued regular followup with your surgeon who can perform a thorough evaluation and discuss with you the best treatment options to address your concerns. At one month out from surgery, you are still fairly early in the healing process. Swelling can take months to years to fully resolve. If this swelling continues to remain the same, your surgeon may consider measures such as steroid injection or possibly a revision surgery down the road to address suspected focal scar tissue or a displaced cartilage graft. 

There are a few possible things for that prutruding part.
It is maybe deviated septum, swelling, scar tissue, or deviated medial crus of alar cartilage.
One month is very early period after operation.
Tissue is still swollen, there is much scar tissue in ths skin.
Cartilage graft is not fixed yet.
You need to wait for at least 3 months, then you can do follow-up with the surgeon.
If it need correction, you can have it in 6 months, but it will be very simple.
You don't need to worry about that.