If a hard thing grows inside the finger and it hurts to press it up, there are usually several factors as follows: first, the most common factor is infectious factors, finger nails are especially easy to be infected with inguinitis, because the nails appear to be stabbed by knives and guns or retrograde infections, resulting in bacterial and viral infections, there will be endogenous superfluous organisms resulting in the clinical symptom of pressing up and consciously having a hard thing to appear. Secondly, the finger is especially easy to be infected by fungi, in the fungal infection of the finger will also appear inside the finger consciously grow a hard thing, press up the pain, accompanied by pus bacteria appear. Thirdly, if the finger is accidentally infected with prickly or burr-like substances into the finger, there will also be a hard thing in the finger to press up the clinical symptoms of pain.