I have bumps on my private area!! Help

Ok ladies so I've had these before in the past. They are small bumps in my private area usually I think caused by razor?? I have really sensitive skin. And they go away within a couple of days but they just get uncomfortable and actually painful because my panties rub on them lol anyway any of you know any other reason why I would get them ? I've been getting them more frequently lately :( and it hurts. Or how I can get rid of it ? It's really one that is bothering me ! I thought It was my razor but I've been using the same kind forever idk what else could cause it