Perineal hernia happens in people, and appears as a sudden swelling in perineum, mostly in people with chronic constipation problem.
It can cause discomfort with sitting.
Another possibility for this lump is a sebaceous cyst, smooth to the touch, vary in size, round in shape growth, resulting from blocked sebaceous gland.
It is benign growth, that can be surgically excised.

See abdominal surgeon or general surgeon!
Best wishes!
Marija

i am waiting to go to the doctor in a couple of days, i think i have ruled out a hernia however because since i wrote this it popped almost like a pimple (its gross i know, sorry) and now the size has reduced significantly. so i am thinking a cyst or something? I really want to see a doctor about this....

Perineal hernia
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Perineum in humans

The muscles of the male perineum

The muscles of the female perineum
Gray's subject #120 424
Perineal hernia is a hernia involving the perineum (pelvic floor). The hernia may contain fat, any part of the intestine, the rectum, or the bladder. It is known to occur in humans, dogs, and other mammals, and often appears as a sudden swelling to one side (sometimes both sides) of the anus.

A common cause of perineal hernia is surgery involving the perineum. Perineal hernia can be caused also by excessive straining to defecate (tenesmus). Other causes include prostate or urinary disease, constipation, anal sac disease (in dogs), and diarrhea[citation needed]. Atrophy of the levator ani muscle and disease of the pudendal nerve may also contribute to a perineal hernia.

**Thought this may be helpful - Yes humans can get perineal hernias...

BassGuy

This to me sounds like a perianal abscess. You mentionend 'pimple' and 'reduced' in size...this to me suggests some sort of drainage of puss? If this is correct it indicates the presence of infection. Please see a doctor! While the drainage will relieve the pain temporarily an infection may still persist. Ask your family doctor to refer you to a colo-rectal surgeon or gastroenterologist.

I am not a doctor but a 22 year old male who has had similiar symptoms with the above mentioned diagnoses.