Hello and wecome to hcm. I have read your question and I can understand your concerns. For how long this lump is there.? Is it decreasing or increasing in size..? Does it increase in size while coughing.? Do you have fever.? Do you dibetes.? If i were your treating physician i would have ruled out sebaceous cyst by skin pinch and fluctuation test.this cyst arises due to blockage of sebaceous gland s duct which secretes sebum.sebum lubricates the hair.It is common in this area.it is treated by excision surgically. Other possibilities are Mycetoma which is fungal infection caused by actinomyces.it is treated by antifungals such as ketoconazole or fluconazole. Inguinal hernia can also cause lump in this area which is diagnosed clinically by cough impulse,and ring occlusion test. Thanks. Hope the answer is helpful Keep asking us at hcm. Regards