Advice please

Hi guys! I'm only 19 and I've had P since I was 12. It started all over my scalp, which cleared around 2 years ago. However one particular area, on my left connected onto my forehead, has been damaged to the point where no psoriasis is there now but a large patch of red/pink skin. And having dark skin it really stands out. I have been struggling to tie my hair up for the past 2 years because you can see the burn/scar. Also since then I had started to get it behind my ear. Was given steroid treatment from gp just recently which would calm it for a few days, but now it has spread to the back of my neck and I can't even wear clothes that show edge of my shoulders or neck. Also I have been putting off the hairdressers for a year now as even tho my hair is so healthy and scalp too, I feel embarrassed that they will see my P. If I showed you photos you would feel disgusted. Some days are so bad I get so depressed and wish it would all go away. I get upset when I see girls with ponytails, I know it sounds ridiculous but I always was told I had amazing hair throughout my childhood. I remember at school having the longest thickest hair, I'd have every hairstyle you can think of. But now, I have a middle parting so I cover the scar at the front, and just always have it down. I've gotten to the point where even at home, my family don't see my hair up, because I feel embarrassed and upset. I feel like nothing works! I hate going to the derm because they give me silly creams that end up making P worse. I've read somewhere about light therapy. Does anyone know about this? Where I can get it/Try it??? HELP please Btw my name is Nitasha