"Hair Growth deep inside the vagina is a well known secret for Trans-Women who've undergone Sex Reassignment Surgery. But this is a well known medical fact among surgeons who perform the surgery and it's an issue regularly discussed by Trans-Women.
How is this possible? During surgery, the penis is not actually "chopped off" as is commonly believed. The soft tissue inside of the penis & testicles are removed, but the outer skin of the penis & testicles is then placed inside the body to make a vaginal hole: the skin of the testicles are placed deep inside the "vagina" to create length. But after surgery, many trans-women deal with the stress of discovering hair growing inside their new "vagina".
The Philadelphia Center for Transgender Surgery website explains how: "The scrotal (testicle) skin is used to add to the length of penile skin to increase depth of the vagina. If hair is left on the scrotal (testicle) skin, it can continue growing inside the vagina and it will be more difficult to keep the vagina clean. Also, with intercourse, some of the hairs can break off and wind up high up into the apex of the vagina, occasionally causing formation of a "hair ball" which can result in chronic irritation and infection. For this reason, it is always good to have at least one or two speculum vaginal examinations each year to make sure the vagina is free of hair balls."