<s>[INST] I develop a rash only at night and not every night, that is on my front midsection from the waist up to under the breasts and on the lower part of the breasts.  It is prevalent along the waist between my breasts but below the breasts.  It is very itchy. [/INST] Hello and thank you for your question. It sounds like you have some sort of dermatitis. Sometimes we can pinpoint a cause for dermatitis, but 80% of the time we don't know why it occurs. What I would recommend for you, it to see a dermatologist and possibly get a biopsy done to see what this condition might be. Some advices that I can give to you are:-avoid scrubbing the areas of the rash with soap-try to take quick showers with not very hot water.-you can also use a lotion which is available over-the-counter, called calming lotion It is important to see a dermatologist as soon as possible to get better. Hope my answer was helpful, if you have any other question I will be glad to answer, thanks! </s>