17 yo, 6’3” 170 lbs, trying to gain some weight. A few months ago I weighed 180, then I got sick and lost 10 pounds, not been able to get that weight back. I am consistently lifting every other day, not currently using Whey protein because of the acne that it caused.

Question: How should I go about gaining 10 or so pounds without eating a bunch of junk food and without using protein?