JunkFood, its side-effects

I have eaten lots of junk in the couple of months--more junk in the last month than in the last two years. (junk = candy bars...usually Reece's cups, Almond Snickers, and plenty of cheese puffs).
Back when I was eating junky all the time I had what I call the ItchyScalp-- a itchiness on the scalp that, after scratching would turn flakey and then scabby. I wonder if it wasn't related to seborrheic dermatitis, I had been to several dermatologists for it, none gave me a firm dx but would dispense advice like..use gentle shampoo, nizoril, gave me some kind of topical anti-inflammation preperation to put on my scalp, etc. Symptomatic relief, no lasting solution.
Well after a long while (year or so) of fair compliance with Eat To Live way of eating (LOTS of veggies, fruit, beans, less than 10 percent of calories derived from junky foods) my scalp problem had left completely. I could even for for a weekend without washing my hair and it wouldn't itch like crazy (impossible in the years previous).
Now the ItchyScalp is back to a degree and finally this week the sores started forming on my hairline from my scratching.