There really is no good treatment to make the lines fade as this is an engorgement of blood vessels due to allergic irritation ("allergic shiners"). I would recommend you see your primary care physician for prescription allergy medication like a nasal steroid spray or an antihistamine by mouth. If medical treatment does not work, you might want to see an allergist or an ENT who does allergy testing for further treatment.
Hey newnose.
Welcome to the forum.
Seek an "Allergy Antidotes" or "NAET" trained Doctor or Practitioner.
They can facilitate drugless allergy elimination (Energy medicine).
I use the"Allergy Antidotes" with very satisfactory results.
Just do a search for your area.
The dark nasal lines should dissipate over time,
following successful treatment.
Wish you well.
Niko