Should I be concerned?

Okay so I never really used to shave my, well, downstairs, a whole lot. I had one serious boyfriend in the past so I did every now and then for him but after we broke up I was pregnant and got out of the habit because I physically couldn't lol 
But now I've got a serious boyfriend, we've been together almost 2 years now so I shave regularly. 
And I've noticed these bumps, on the inside of my "lips". Like one or two at a time in different spots. Usually after I shave, like maybe a week or two when my hair's growing back. They're flesh colored, almost look like mosquito bites. They don't hurt or itch or bust open into sores. 
I've always just brushed it off as ingrown hairs since I have really sensitive skin and honestly it's weird but my hair grows weird down there and I've had ingrown hairs before even without shaving. 
So do you guys think that's all it is? Or should I be worried about an STD? 
I know I'll get a lot of different opinions and advice on this, but I know my man would never cheat on me. I'm thinking if it is an STD of some kind, it's from his ex and he doesn't know. 
I don't know, should I be worried or is it nothing? 

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