Hi there...what is your actual problem? Hairs in the intermammary area or rashes. For unwanted there two treatment options - topical creams like eflorithine hydrochloride cream (less effective) and laser(better than creams, but expensive). If it is rashes, it will require detailed clinical examination to diagnose it- it can be anything from intertrigo to seborrhic dermatitis. So kindly consult a dermatologist for further evaluation.