I found an open sore on my mons pubis that looked kind of like an ingrown hair, but has grown to have fluids, is very painful, and dark colored. 16/f?

Please see your: doctor, as this sounds like an infection. The only way to be properly diagnosed and treated for this is to be seen by the doctor.

Open sore Rx: This open sore in the mons pubis may be a ingrown hair that is now infected. Clip the hairs above the sore and wash the area with an anti bacterial soap like Phisoderm or Hibiclens 3 times daily. If the sore does not heal in 3 days or gets worse see a MD for antibiotics and confirmation of the cause of the open sore.