Symmetric lumps under skin - what are they?

I discovered a cluster of 4-5 lumps either side of my groin that I can’t see but can feel under the skin. They range from a few millimetres in diameter to pea sized and are all movable by about 1 cm. I have no clue what they are but am confused due to how there is a cluster either side.

Any clues?

There are several lymph nodes that are located in the groin. By the way you are describing them, it sounds like swollen lymph nodes. You should have them checked.