Hi, You seem to have psoriasis vulgaris. It is an autoimmune skin disease with genetic tendency. It may be precipitated or exacerbated by many factors like stress,anxiety,sun exposure,dry wheather, exercise, trauma,infection anywhere in body, drugs like chloroquin....and so many other factors. I usually advise to have thorough investigations to rule out any other systemic disease before starting the treatment. Beside methotraxate, I also advise acitretin 10 mg once a day for long time. Combined oint of steroid with salicylic acid application on the lesions would clear the lesions. Tar and salicylic acid containing shampoo may be used to cleanse the scalp. Have patience. Relapse may be there. Restart the treatment if there is relapse. I hope you got my answer. Thanks. Dr. Ilyas Patel MD