Card B unveiled her new lip piercing - which goes right through her bottom lip.

It's an interesting spot for a lip piercing, especially given Cardi's history of bumps on her lip.

In the past, the Bronx singer has been seen sporting a mystery bump on her bottom lip - and fans speculating that. it could be a cold sore - known medically as a herpes simplex bump.

Here is the lip piercing:

It's a cute lip piercing, and it serves to cover her her bumps . . . nice.

There are two types of herpes simplex virus that can cause cold sores: herpes simplex virus type 1 and herpes simplex virus type 2. Cold sores are usually caused by herpes simplex virus type 1. Genital herpes are usually caused by the herpes simplex virus 2

You usually catch HSV when you come into contact with people or things that carry the virus. For instance, you can get it from kissing someone who's infected or when you share eating utensils, towels, or razors.

According to TMZ, Luis Vega, the owner of City of Angels Tattoos, tells TMZ ... Cardi randomly walked into his shop Monday looking to get her lip pierced. Luis says he didn't know it was Cardi -- amazing, right -- until they started talking.

It's funny ... Luis thought he recognized CB's face, and initially figured she was just a former client. After Cardi told him she was from New York, Luis told her she looked and sounded like Cardi ... and that's when light bulbs started going off.

Luis slowly realized he was dealing with an A-lister, but his suspicions weren't confirmed until he poked his head outside and saw Cardi's entourage in a caravan of luxury cars.