Suggest Treatment For Psoriasis And Flaky Skin Around Groin Area And Penis

I am using Ionax T shampoo and Momate lotion. I have recently developed psoriasis type for formations on my scalp that somewhat looks like severe dandruff and has a pinkish shade. The color of the scales, to my untrained eye, is not really silvery white but rather dirty white or in some cases, very light yellowish. My doctor says it is psoriasis. I have also heard about seborrhic dermatitis. I have seen one spot of piled dry skin on my leg and it was reddish in color, turning dark brown now. And also on the area over my penis, in the pubic hair region. Same flakes of skin. A little bump. Do you think either psoriasis or dermatitis is cured? Do they cause hair loss? Do they spread to the rest of the body? If yes, what percentage? Oh one more thing, the scalp itches very much when I go out in the sun. Is sun helpful in treating this? A few stats about what helps, what does not, whether it spreads and where, and what works will be helpful. Regards, Ron