Lump under skin. What should i do?

I have a very small lump deep under skin on the right side in the middle of my neck not connected to the throat thats not visible only i can feel its like a small bubble and rubber like and it moves around when i feel it I don't know since when it was their i came to know about it three days back it hasn't grown in three days it is still the same and without any other symptoms i have shown it to the nearby ENT because i could find him only in the lockdown he told me its just a lump made of fatty tissue LIPOMA nothing serious only lumps which are behind or near the ear or on the throat or thyroid are serious since its location is not on a serious area i shouldn't worry but i should keep an eye on its size because i don't know how long it has beeen there...what should I do