Seborrheic dermatitis & folliculitis.

I had been suffering from folliculitis since few yrs.after using KT salisia shampoo condition was better since few months. But i am also facing excess sebum on scalp and Doctor told that I have been suffering from (seborrheic dermatitis which causes extra sebum) 1)I am in weight loss...I lost almost 45 kgs in 9 months..Due to that lack of nutritions my hair on scalp getting oval shape or thinning in following image which I shared? 2) my scalp on side part of hair getting Side line.in that hair is getting thinning in that oval shape area. 3) Is the reason of folliculitis & pannicultis or excess sebum or dermatitis. Few years back I used minoxidil too..but since 9 months I am in strict diet..side part of hair is getting thinning and lost thickness and stiffness I am using "curlzvit" tablet for 2 months..condition was better..but that hairline in side part and front part of hair getting thinned..please verify and describe the alternative methods to grow hair on that area