Is It Normal To Get Pimples On The Lip Or Mouth Area?

Hi, may I answer your health queries right now ? Please type your query here...Sometimes I get a pimple on the top of my lip or in my mouth area. I've never had an actual cold sore. I was tested for herpes and was told it was negative. What could this be? Is it just "period pimples" Is it normal to get pimples on the lip/mouth area? Often?