Linea nigra without pregnancy. Is it possible to fade this with tretinoin?

You could certainly try some tretinoin on the area, but it might take a very long time to make a difference. Ask your dermatologist about hydroquinone as a possibility. The dermatologist will be able to make specific recommendations based on your skin type, and what the appropriate diagnosis is. Depending on many different factors, sometimes pigment can be improved with certain laser or light-based treatments. Please see an expert, and best of luck!

Thank you for your question. Tretinoin may help lighten linea nigra, but if there is a deeper component, then tretinoin will not be effective. I highly recommend you consult with a board certified dermatologist to have your skin evaluated because different conditions can mimic linea nigra and appropriate treatment options need to be discussed. Take care and good luck.