Hi. Greetings . bad odor in arm pits may be related to food, but more importantly to increased sweating and microbial colonization. Try using a anti bacterial soap or a benzoyl peroxide based creamy wash. This may help. Also you'll need to check with the dermatologist if you are suffering from any fungal infection or bacterial skin infection of arm pits which worsens odour. Increase your daily water intake. Botox treatment apart from solutions helps in reducing sweating. Hope this helps.