Canon EOS Rebel SL1 18-55mm IS STM Kit Instruction Manual page 86

Do not hold the camera in the same posture for long periods of times.
Even if the camera does not feel too hot, prolonged contact with the same
body part may cause skin redness, blistering or low-temperature contact
burns. The use of a tripod is recommended for people with circulation
problems or very sensitive skin, or when using the camera in very hot
places.
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