Need more information to advice you more accurately.
Usually such lumps are lipoma, subcutaneous cysts or sebaceous cyst.
None need urgent attention unless painful or rapidly growing. Get a clinical consultation when possible.
Next Steps
let me know of size, exact location, change in size, skin condition over lump. and time since it is present.
Health Tips
avoid touching, pressing , rubbing etc.
in case of change in size or persistent pain consult doctor clinical or online.