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The nervous system senses the stress the body is undergoing and causes an increased production of cortisol along with other hormones. These stimulate the sebaceous glands to release more oil, causing rashes due to the irritation of the skin.
Even a noncontagious, noninfectious rash can cause discomfort and anxiety. Infection-associated rashes, such as ringworm (tinea), impetigo, Staphylococcus, scabies, herpes, chickenpox, and shingles, are treated by treating the underlying cause. Infectious agents that can cause a rash include viruses, bacteria, fungi, and parasites. Determining the specific cause of rash usually requires a description of the skin rash, including its shape, arrangement, distribution, duration, symptoms, and history. All of these factors are important in identifying the correct diagnosis.