Hi i have a lump on my neck on the left side no bigger than a cm length and width, it is not painfull it is ju

its your lymph node...white blood cells are produced there, your body may be fighting an infection therefore increasing your white blood cell count which is causing it to swell up a little bit. if its smaller than an inch than this is actually a good thing your body is winning the battle with the infection. no harm but if it gets painful Placing a heating pad (on low) or a warm towel on your painful lymph node may reduce the soreness. It may have negative effects so use with caution. if it continues to have pain or worsens (increases in size) in this case you should have it check by a doctor. hope this helps!