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4. Symptoms

Because humans are inappropriate hosts, when the cercariae penetrate exposed skin, they usually cause immediate irritation and itch due to the body’s immune response. Sometimes, the itchiness will subside and resurface within the next 24 hours, along with a rash. Cercarial dermatitis looks like raised red welts on the skin. The length of time in the water is directly related to the intensity of symptoms.

immune response rash irritation HeikeKampe / Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.