Why does my face and neck get itchy in spots just after I eat something?
by the way I am a 19 year old guy
You're most likely having an allergic reaction to those certain foods. Make a track of whatever you're eating and then eliminate them.
You probably have a food allergy. If you haven't noticed what food is causing it start a food diary and start tracking it.
Allergic to an ingredient.The way you described it, it is a moderate to a slight allergy
Is it with everything you eat? Or just certain foods?