Pupils of the eyes dilate to allow more light into them. Liver increases the conversion of molecules into sugars to provide the body with more energy. Secretions are increased, due to the body going into overdrive. This, in turn, means more sweat, oils, etc. That's why your hands, feet and armpits get clammy when in a stressful situation.
Skin can become red, blotchy and itchy.
Stress may also be capable of exacerbating or causing flare-ups of existing skin conditions, such as psoriasis, seborrheic dermatitis, dandruff, etc., according to Dr. Jerome Shupack, dermatologist. High stress can even affect hair, causing temporary loss in some individuals. Statistics show the number of American's suffering from stress-related disorders and disease top 20 million, with job stress being the most common stress that leads to deteriorating health.