I have been getting a mild rash under my left breast that comes and goes quickly.  The area itches and turns red with small bumps and then goes away within a couple of hours.  The only thing is it comes and goes.  This has been happening for almost a month.
Hi, The rash occurring below the left breast off and on might be hives.also called urticaria. It may be without any cause.idiopathic or secondary.some cause may be there. You consult dermatologist for firm diagnosis and treatment. Thorough history may be taken by him. Investigations may be done to find out internal cause. I would advise antihistamines like fexofenadine 180 mg once a day till you get relief and steroid like methyl prednisolone in tampering dose if needed. You may feel better in few weeks. I hope you hot my answer. Thanks.