Hi there ~
I understand your concerns. While I am glad that you have quit smoking
cigarettes and marijuana, the rash is somewhat concerning. Since the armpit rash
gets better with flucinonide I believe that the rash was an allergy
of some kind. I wonder if you applied that to the other regions as well where you had the rash. If you did and it disappears you do not need to be worried, if it does not then you might have to look into other reasons for the rash and the place to start with is to consult a dermatologist
who can check the lesions to see what they may be and prescribe you medications. I hope you have a good recovery. I also advise you to not drink and stop using alcohol.
I hope this helps. Take care and have a lovely day!