If whatever you have? What do you mean by that?
drain it out.
Yes , it's most like due to bad shaving ( ingrown hair). I am no doctor but i speak from my own experience. I used to suffer from that but it's been three year now and I have not experience d it since. I don't know if/how you remove your pubic hair but i shave and i just improve my technique. Which i suppose helps. Also do shower with a good vaginal soap like vagisil , because when your hair is regrowing , your skin rubbing against your clothes might also so cause that ( plus sweat , heat etc..). shower first and let hot water pour on you a good ten minute before starting your shaving . I use soap and babyoil to shave my pubic area, i get a better shave and no ingrown hair issue. but when i did get those painful pimple , I constanly ran warm water on it , for it to become softer sooner and the pus to come out faster . Then once it popped out I just rinsed the area with warm water again and then shower with vagisil. Also if you are all shaved , your skin is more exposed and vulnerable , so be even more hygenic when you are on your periods , especially if you have a heavy flow ** good luck ladies
that... you might want to get checked out.