I noticed a dent on the tip of my nose, can this be fixed or stopped? (Photos)

The appearance you describe is a bifid tip which results from the groove between the paired nasal cartilages. It is possible to correct this using a small graft and this is best performed with an open rhinoplasty. 

Hello and thank you for your question. This is due to a separation of your lower lateral cartilage.  Based on your
photograph, you may benefit from a tip refining rhinoplasty. Your surgeon can
accomplish this by trimming, suturing, and reshaping the cartilage in your
lower nose. Cost varies based on geographic region and surgeon expertise.  Make
sure you specifically look at before and after pictures of real patients
who have had this surgery performed by your surgeon and not just a computer
animation system. The most important aspect is to find a
surgeon you are comfortable with. I recommend that you seek consultation with a
qualified board-certified plastic surgeon who can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D. FACS
Harvard-trained plastic surgeon

silmarne,What you are seeing is the relatively thin skin your nose draped over the paired cartilages that make up the tip. It is a normal variant but certainly is amenable to correction with surgery. Seek out a consultation with a reputable rhinoplasty surgeon to see if your desires can be accomplished with surgery.Best wishes!  Harry V. Wright MD, Sarasota, Florida

What you have is a bifid nasal tip or a separation of the lower alar cartilages at the cost projecting part of the nasal tip. It often also extends down into the columella below the tip. This can be corrected by either suturing the two cartilages closer together or placing a cartilage grafts in the split, which ever offers the best aesthetic outcome.

 What you are referring to is the normal cleavage plane between the two nasal tip cartilages. Depending upon the width of the cartilages and skin thickness, this can be very prominent or not visualized whatsoever.  A rhinoplasty procedure can accomplish improvement in this area a combination of procedures. A small moreselized cartilage graft can be placed in that area to help with the cleavage. This must be harvested from somewhere inside the nose. Alternatively, suture techniques and conservative cartilage removal can accomplish narrowing the bulbous tip  and reducing the cleavage between the two cartilages. For more information  and many examples, please see the link and the video below

Based on your photos I can appreciate tip clefting/bifidity and slight deviation of he columella to the left side. Don’t see an obvious alar collapse, but it is possible that it occurs dynamically, meaning when you breathe in. Based on your history, you have several plausible causes of this tip change, such as change in tip cartilages and soft tissues due to your autoimmune condition or the medication you are taking for it, prior nasal tip infections, etc. The quickest way to correct the bifidity would be a filler injection, however given your medical history I would not recommend it. I would also be very cautious considering surgical correction for the same reasons, unless you develop significant breathing problems necessitating surgical correction.