acne itchiness and blushing

Well i am a 18 yr old teenager and i have quite severe acne problem but now it seems to have recovered a little. The problem i am facing now is when i get hot or feel shy, my whole body becomes itchy. The itchiness is horrible, it's like thousands of needles poking my body. So i always control it till sometimes i blush. I wonder why i always blush and my body gets very warm. Is it related to health problem or psychological problem? I hate it when my face started to warm up(blush) suddenly. I felt down because of this and have been avoiding some social contact with others. Someone please help me out. Thank you.