Hello Thanks for query . You are likely to have Sebaceous Cysts over scrotum and at the base of the penis . 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. Since you have injured one at the base of the penis resulting into bleeding you need to take broad spectrum antibiotic like Cefotaxime along with anti inflammatory drug like Diclofenac twice daily along with topical antibiotic ointment like Neosporin twice daily. Ensure th wash genitals with warm water twice daily . Dr.Patil.