Sometime it can fail. Other effective treatment is there. Please send photos using online consult option for proper examination diagnosis and treatment. Donot use soap for treamtment.

The problem the you are reporting could be a fungal infection of the skin. It needs to be treated with proper antifungal tablets and creams FOR A PROLONGED DURATION to completely eliminate the infection from the skin. Most common cause of recurrence is premature cessation of treatment. Also your clothes have to be washed and sun-dried and family members need to be treated if anyone else also has it. However without proper examination and confirmation of the cause, treatment cannot be advised. You should send me images through private online consult for a better assessment of the problem and approaching it accordingly. I practice in mumbai itself. You can meet me and get it properly assessed if you wish. A direct consultation would always be preferable to an online consultation. Hope this is helpful.