Skin Rashes. Is difficult to tolerate.

Hlo Ma'am/Sir Actually,you know what doctor I 've been facing skin,hair and nail problems since a 4years.but skin one from childhood.I don,t know why my skin is so dry and rough and in adddition to it is black from somewhere but in any strange manner.even during summer ,i gone throungh massive itching and pruritus on whole body.even my hair is going whitish and rough. moreover my nails are thick ,crumbling and dry.I also having lot of dandruff in all my hairy parts (head,bear,eyebrows,pelvic,armpit).what should i do sometimes it is difficult to tolerate . there are some pores on hairy side on my body which looks messy. in other words my body is no smooth at all which constantly perishing my health and personality both phyaically and mentally..