Hello, thank you for putting your trust in our site, my name is Dr.Soliman and I will be glad to answer your question. This is -by your description- can be considered an abscess and using betadine solution would not help in this case. what you should do for treatment of this abscess if it is considered a little big, is excision and drainage by a primary doctor or a skilled nurse and after that you should keep the dressing dry and change it day by day and use systemic antibiotic like cephalosporin and local antibiotic bevatricin spray, also always wear loose underwear and maintain aeriation to the wound for as much time as possible. I hope this answer fulfill your query and if you are satisfied with the answer please consider giving 5 star rating , and feel free to ask any additional questions and I will gladly help you with an answer.