When very panicked/stressed i get painless red blotches all over my chest. it goes away after a while. can you explain what it is?

This is likely: triggered by your anxiety - it could be hives/ urticaria. To address stress: Talk about feelings & address problems. Don't avoid them. Aim for 7.5 - 8 hours of sleep/ night. Daily physical activity is optimal in a green space. Eat healthfully. Cut out junk carbs, caffeine & alcohol (or moderate). Try Qi Gong, Tai Chi, acupuncture, acupressure, homeopathy, meditation, Yoga or exercise program