When there is a hard thing growing on the fingertip, there is a black spot inside, it is recommended to see if there is any pressing pain, if the pain is recommended to seek medical treatment in time, if it does not hurt, you can observe for the time being. Generally speaking, there is a hard thing growing on the fingertip, there is a black spot inside, this situation is more common cause of folliculitis, corns, foreign body residue. Different situations have different ways to deal with it. 1, folliculitis: often due to hand skin unclean, resulting in follicular canal blockage, follicular secretion can not be discharged through the follicular canal, caused by the fingertips on the growth of a hard thing, there is a black spot inside. Treatment on the local disinfection and change, external erythromycin ointment treatment; 2, corns: due to long-term wear and tear of the fingertips extrusion, resulting in the formation of local skin keratin layer hyperplasia corns, resulting in the fingertips long a hard thing, there is a black spot. Treatment can be localized hot compresses, electric physiotherapy, follow the doctor’s instructions to use the corns cream treatment; 3, foreign body residue: most commonly found in the fingertips have been stabbed by a foreign body, foreign body residue in the body, resulting in the fingertips grow a hard thing, there is a black spot. Treatment is mainly surgical treatment, the line of foreign body removal surgery.