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Thanks for you condition.
Please do not worry about this since this is normal. Testicles main function is in production of sperm, and to do this they must be kept at just the right temperature. Therefore the scrotum will change its size for the testicles to stay at that right temperature. This is the reason that in a cold environment, the body sends a message to the scrotum and it will then shrivel and shrink to preserve heat.
This is normal physiology which will ensure that he will be fertile. However when he touches his testicles he should be able to feel the touch irrespective of the temperature. If he is not able to feel the touch sensation than he needs to consult his doctor to look for any abnormality.
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Yes this does look concerning and requires an examination by his doctor.
That will depend on the cause for this. He may need to have an ultrasound examination of the testicles to know the cause.
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