What is the difference between hair that falls that has a white bulb at the bottom and the other has black bulb at the bottom. Do both grow back?

Question

whit bulb at the end means that the hair is in telogen, i.e. already dead as in not growing anymore...hair grows for 2-4 yrs, and if you pull it out during this stage it doesn't have a white bulb, as it's still inside the hair shaft...then the hair stops growing and goes into catagen for 2-4 weeks, where it moves the white bulb outside the shaft, separating from the folicle...finally, the hair moves into telogen for the next 2-3 months...at this point the white bulb is completely out...then in a normal situation, a new hair from underneath starts pushing the telogen hair out till it falls out...in AGA type of situation, when there's no hair growing underneath the hair remains in telogen till it's pulled out either during hair washing/brushing...or if you pull on it...hence we see more hair come out during washing/brushing

Amar Singh · Accepted Answer

whit bulb at the end means that the hair is in telogen, i.e. already dead as in not growing anymore...hair grows for 2-4 yrs, and if you pull it out during this stage it doesn't have a white bulb, as it's still inside the hair shaft...then the hair stops growing and goes into catagen for 2-4 weeks, where it moves the white bulb outside the shaft, separating from the folicle...finally, the hair moves into telogen for the next 2-3 months...at this point the white bulb is completely out...then in a normal situation, a new hair from underneath starts pushing the telogen hair out till it falls out...in AGA type of situation, when there's no hair growing underneath the hair remains in telogen till it's pulled out either during hair washing/brushing...or if you pull on it...hence we see more hair come out during washing/brushing