Hormones, especially testosterone and DHT, are key for penis development and function, and testosterone therapy may help with erectile dysfunction in those with low levels.
5 citations,
July 2005 in “British journal of dermatology/British journal of dermatology, Supplement” A man grew hair on his penis, which is not common, and needed surgery to remove it.
8 citations,
August 2018 in “Turkish journal of urology” Hair wrapped tightly around a boy's penis can cause serious damage if not treated quickly.
6 citations,
January 2013 in “Urology” An 8-year-old boy with bed-wetting issues suffered a severe penile injury from tying a thread around his penis, requiring urgent medical treatment to avoid worse outcomes.
13 citations,
January 2019 in “Endocrine journal” Dihydrotestosterone treatment can help penis growth in boys with 5α-reductase deficiency but doesn't fully normalize size after puberty.