It might be a lymph node, a cyst, a tumor. or just an extra lump of skin. That area of the body is very deilicate - suggest you see a doctor for a valid diagnosis.
Perineum, http://en.wikipedia.org/wiki/Perineum
A small firm lump under your skin at the base of your penis could be a cyst, but this should be confirmed with a doctor.
The perineum is an area of skin that is located close to the anus. To pronounce perineum, you say per-in-ee-um.
The perineum is the skin-covered muscular region located between the vaginal orifice and the anus. It contains various muscles that support the pelvic floor and play a role in sexual function and bowel control.
It is probably because you have hit your bruise and formed a lump there.
Well, raccoons get this lump, called a debrah when it is kept in captivity. If you love it, you will set it free and the lump will go away.
herpes..
It is called the perineum
perineum
A lump under the skin near the back passage could be caused by several factors, including hemorrhoids, cysts, abscesses, or skin tags. It's important to monitor any accompanying symptoms, such as pain, bleeding, or changes in bowel habits. If the lump persists, increases in size, or is concerning, it is advisable to consult a healthcare professional for a proper diagnosis and treatment.
There are all sorts of lumps in your skin. They can be mosquito bites, goosebumps, warts, zits, and many other types of diseases. If you have a lot of lumps in your skin and are pretty small, they can probably be a goosebump. Sometimes, chicken pox can be formed into a lump. Chicken pox is red, so I'm not assuming you have chicken pox. I am assuming you have goosebumps. You get goosebumps when you are cold. If those lumps are itchy, it's probably a mosquito bite. If it's not, sadly it's probably a wart, zit, or something in a different type of lump. Hopefully this helped!
The medical term for any swelling is called a lump