Micropenis is an unusually small penis. A common criterion is a dorsal ( measured on top) erect penile length of at least standard deviations smaller than the. Hi I am 35 years old and I have a micropenis (6 cm erect). Anyone knows if there is a treatment for my small problem? The only treatments I could find were these. Erect micropenis - Mitt kakfat - Sosso Microphallus.