Hi and welcome to HCM.
can show for sure what it is, but usually this is just a swollen lymoh node due to respiratory infection. But if there is redness
around it or it is fixed to background or growing fast then you hsould visit specialist. If this is soft and movable then it can be lymph
node or lipoma
. To be sure you can do ultrasounds with needle biopsy and see exact casue. Wish you good health.