Best cheap solution for acne available.

Thanks for taking the time to read and answer my question. I am a traveler from the US staying in Delhi for a short time. As a traveler, I am constantly changing climates and skin products. About 4 months ago, I started having a lot more issues with my acne. Worse than when I was a teenager! I've tried different skin products but nothing really seems to effect it too much. I stopped using concealer a couple weeks ago and it did seem to help a bit but the problem is still there. It's also gotten a lot worse just now after Holi (to be expected) because of the paints. I want to find a cheap solution to this problem that can continue helping me long term while I continue to travel to many different places and climates. Any suggestions at all?? If I see a dermatologist in Delhi, how expensive would all the medicine and everything be? Thank you!!