Hello Thanks for query . Based on the facts that you have posted you seem to have infected Sebaceous Cyst over scrotal wall . 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 infected. Take antibiotic like Doxicycline and anti inflammatory medication like Diclofenac twice daily for a week . If problem persists even after taking medications you will need to consult qualified General surgeon for evaluation . You may need to get it excised in Totto under local anesthesia. Dr.Patil.