hello, can you take a digital photograph of the fingernail?
Is it all of the nails?
Do you have thickening of the end of the finger too?
Hello, do your fingers look like this:
Thanks for the information, that picture (from university of liverpool) is of a symptom called 'finger clubbing'. It is associated with chronic disease such as COPD and liver disease, heart disease or inflammatory bowel disease.
So there are lots of possible causes. You need some basic investigations to make sure that there is nothing going on that needs treatment so you need to ask your doctor to run blood tests and possibly organize a chest x-ray.