<s>[INST] i am 40 years male indian, sexually active, started having a small pimple on the left testis. In due course of time, it started feeling hard and started growing. Some times I have sting when in contact with clothes or underwear. What is the significance? How serious is this issue? [/INST] HelloThanks for query .Small pimple on the scroyum that you aave is mostly a Sebaceous Cyst .The scrotal skin is rich in sebaceous glands and hence prone to get more sebaceous cyst due to accumulation of sebum beneath the skin. Normally they fade away without treatment however they need to be treated if increase in size or get infectedConsult qualified General Surgeon for evaluation .You may need to get it excised in Totto under local anesthesia.It is not a serious issue at all .Dr.Patil. </s>