Micropenis is defined as a penis that is normal in appearance but less than 2.5 standard deviations in length from the average length for its age, but there is a lack of authoritative standard reference values. As this diagnosis is psychologically stressful for men and usually has a serious impact on self-confidence, special attention should be paid to the measurement by holding the head of the penis as straight as possible so that its length corresponds to the length of a fully erect penis and using a measuring tape to measure the distance from the front of the pubic symphysis to the tip of the head of the penis.
Many men with normal penis development often compare their penis with that of other men, and if they find that it is shorter than other men, they may have low self-esteem and fear and seek medical help. In the case of children, it needs to be judged differently according to their specific age.