Hi,
I am not sure over your symptoms usually there are no causes in which testis suddenly reduce in size in which there is no pain or no direct injury to testis.
This can happen that you might not be feeling for sex since a few days that is understandable and every one passes through that phase and you should not be worried about that. But if you really think that your testis has reduced in size without having any pain or any other symptom then you should get an ultrasound of your testis.
Als ...
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