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Patchy scaly skin with peeling and bumps on neck and vaginal skin is a fungal infection
due to continuous sweating and secretions leading to excoriation of skin. This needs to be treated immediately to avoid further spread and complications. Anti fungal treatment would be required. Also make sure the skin on neck and vagina is washed thoroughly with water and the skin is kept dry.
Let me know if you need any additional information. Would be glad to assist you.
Dr. T. Shobha Deepak