Whenever I get nervous embarrassed or stressed my neck back and chest and occasionally face get red blotchy and extremely itchy. how to stop it?

In rosacea, the skin , especially that on the face, gets red when any rise in core body temperature (heat, stress etc) however itching is not expected.

Another condition known as cholinergic hives in which a person gets small itchy bumps plus redness with stress. This can usually be controlled by taking an antihistamine preferably prior to stressful situation as well as after. Would you like to video or text chat with me?