Does it hurt down there? Unpleasant sensations in your bottom area (between your anus and vagina) is called perineal pain and it has a variety of causes: 

1. UTIs (infections of the urinary system)
2. Cystitis (painful bladder syndrome is a malfunction of the pelvic nerves)
3. Injuries (sport accidents, falls, or delivering a baby)
4. Pelvic floor dysfunction (a disease of the pelvic muscles that help your bowel movements and support your rectum, bladder, and uterus).
5. Abscess (a pimple-like bump caused by an infection)
6. Vulvodynia (chronic aching of the vulva)
7. Pudendal neuralgia (an irritation of the pudendal nerve located in the perineum) 

Sources:

What Causes Perineum Pain?, healthline.com

What is Pudendal Neuralgia?, whria.com.au

Chronic Perineal Pain, ajronline.org