Hello Thanks for query .Based on your statement I would state that you have developed a Sebaceous Cyst over scrotum . The scrotal skin is rich in sebaceous glands and hence prone to get sebaceous cyst due to accumulation of sebum beneath the skin. Normally it fades away without treatment however needs to be treated if increase in size or get infected. Take broad spectrum antibiotic like Cefixime along with anti inflammatory drug like Diclofenac twice daily for a week . If does not subside consult qualified General Surgeon for evaluation . He may advise you to get it excised in Totto under local anesthesia. Dr.Patil.