i have hair loss and got to doctor and he gave me finasteride and minoxidil for my hair loss.

I have been using finasteride for two month and i didn't have any problem after two month i stopped using finasteride for two week (i finished all my pills , and i need to get new prescription).

after two week i start again using finasteride , after two day using finasteride i have itchy rash (it's really itchy) in my back and my armpit (both sides).

right now i stopped using finasteride , i want know what should i do ? should i stop taking finasteride for ever ? and rashes how long take to go away (should i take any medicine for that) ?