Andras Fiber is rebellious, another treatment is to deliberately cause an allergic reaction (contact dermatitis) with a chemical applied to the scalp. This treatment causes a rash and often hair grows back to it a few months later. This modality of treatment can however prove to be unpleasant. Some people who lose their hair possess slightly lower iron or zinc levels and can benefit from the use of supplements of these minerals. If a systemic disease causes hair loss, its treatment can help restore hair growth. In cases of sev.