I have had these callous-like growths on the top of the fingers of my left hand. they seem to grow. what are they?

Hard to say,: But it might be warts. Have a dermatologist take a look at it.

Have it evaluated: Some causes of corns or calluses include: friction, pressure, repetitive trauma, and a limitation of joint motion. Some genetic conditions may also cause people to develop calluses on the hands and the feet. Warts which result from a viral infection may be confused with calluses. Treatment depends on the cause of the problem. Have it evaluated by a professional and get the appropriate treatment.