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There are so many different causes of rashes that it is very difficult to narrow down any specific cause of one, especially without being able to see it. Common categories of rash are:

scaly patches of skin not caused by infection,

scaly patches of skin produced by fungal or bacterial infection,

red, itchy bumps or patches over the body, such as on the chest and back.

Although rashes are seldom dangerous, self-diagnosis is not usually a good idea. Proper evaluation of a skin rash requires a visit to a doctor or other health-care professional. Check this site for good information and you may be able to figure out what is going on.

http://www.medicinenet.com/rash/article.htm