Several parts of your story don't make much sense to me. First, poison ivy doesn't trigger severe acne. Second, hand peeling and hand products have nothing to with acne. Third, the side-effects of Accutane are, in my experience, rarely of ever bad enough to stop the medication, especially after three months. Having said all that, I would add that you seem to be doing pretty well, but I can't tell from your description whether the forehead symptoms are a different rash (like eczema r seborrhea) or a side-effect of acne medication. Since you're obviously already seeing a dermatologist, I would suggest asking him or her to have a look and offer an opinion.
Take care.
Dr. Rockoff