Once I was a severe patient of seborrheic dermatitis, worse than you. From junior high school, i suffered a lot form this disease! At the beginning, i felt itchy on the scalp but i didn’t care about it , a period of time later, i found that there were small lumps on my head and my hair even started to loss! I felt so bad and eager to see the doctor, he prescribed drugs for me and told me to keep practice and good mood.I followed his guides and the situation improved a lot. However, this disease was not that easy to deal with,it repeated several times, once i stopped the medicine it would attack me again.That was so bad! After a few rounds of treatment, now i was finally recovered. So if you are struggle with this disease, remember to see the doctor and follow his suggestions! You have to keep proper exercise to building up your physique, don’t have too much sweety food, vegetables and fruits are better for you! Be confident and you are sure to defeat it. Good luck!