Hi. Thanks for your query. Read and understood the problems. You were checking the testicle on your own, found a sensitive mass, and now is it smaller today. This may be due to an acute epididymitis, or a twisted cyst related to the structures in the scrotum which got ruptured or de-rotated. Hence got smaller. Your research may be absolutely wrong as the calcium deposits do not cause any sensitive mass, nor they appear within a day nor can they disappear. I would advise you the following: Get an appointment and a direct physical examination done by a General Surgeon or an Urologist. Get an ultrasonography of the abdomen and color doppler also of the scrotum. A proper diagnosis can lead to a proper treatment if required.