@kpg7121 3mm is .3 cm
Mine is .5cm and is considered very small. Yours seems tiny. The good thing is that, even if worse comes to worse and it is not benign, it is my understanding that it is more likely to be indolent, that is, nothing needs to be done about it. Anything under 1.0 cm is more likely to be either bph related or at least, as I said, nonagressive, and yours is way under that. Best of luck!