I'm curious about the cost of acne treatment!

I usually get told all the time that my skin is clear and radiant, but sometimes a huge pimple pops up during my period or when I'm tired. Whenever that happens, I get so worried about scarring that I want to go to a dermatologist right away to get an acne treatment. However, since I've never done it before, I have no idea how much it costs. How much does it usually cost to get a targeted treatment for just one or two pimples? Since I'm a student, I'd be worried if it's too expensive, so if there are any affordable treatments, please let me know the approximate price range! I want to set a budget before my bank account goes empty.