Suggest Treatment For Itching On Body And Rash On Sides Of Head

GM Doctors, i recently started getting really itchy all over my body and it is becoming very difficult to deal with,i smoke weed and i notice that when i dye my hair the veins swell on my head and i scratch it until it forms like a bruised rash on either side of my head. i am currently taking texa 10 to help with the itchness but not doing much. thanks your'll have a lovely day