Thank you for your help :)
Such a rash is ocasionally developed when using the 24 hour insulin, Lantus. Go to the FDA site and fill out the adverse drug effect form.
There are a number of insulin related drugs on the market with varying degrees of side effects. Since you kept your medications [injectable & oral] a secret from us it's impossible to answer your question.
However, you can perform your own research investigation by Googling the name of the drug followed by the words "side effects" [w/o the " "]. Also, if you take other drugs, supplements, or vitamins compare the drug interactions as some drugs do not behave well with others. http://tinyurl.com/ohmbbq