Does anyone know what this bump could be on my Labia Minor? - Female Health Problem.

• Things about me:
  
• I'm 19.
  
• I'm a virgin.
  
• I masturbate often.
  
• I'm over weight.
  
• I work a full-time job, almost 7 days a week.
  
• I wear underwear.
  
• I take showers.
  
• I'm a hypochondriac. 
• I do not have periods.
  
• I can't afford a gynecologist right now.

So now that most of the possible future questions are answered, I have a problem. Two days ago, I noticed that my -down there- itched. It usually doesn't, so I went to scratch it when a sudden rush of pain shot over me and I felt a pea-sized bump on my Labia Minor almost near my Clitoris.

I talked to my mom about it and she said it was most likely a pimple and not to worry about it.

Well today it's a little bit more irritable than it was, so I decided to try and take a look, so I got a mirror and checked it out. It looks like a small bump with a little white dot on the top of it. It's pretty sore, like the area around it might be raw, but it doesn't hurt when I pee or wipe myself, only when I sit still or touch it.

Does anyone know what this could be? I'm really worried after looking at some of the other stories on here relating to similar but not exact issues.