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During pregnancy, the hormonal balance of an expecting mother is protective against hair loss. However, after pregnancy, the sudden hormonal shift causes acute telogen effluvium.
This hormonal shift similarly causes hair loss associated with taking certain types of oral contraceptive pills. Given a few months after pregnancy, these hairs will re-grow as they re-enter the growth phase of their cycle.
Alopecia areata: Patients develop small patches in their hair which occurs as a result of the body’s immune system overreacting to its own hair follicles. They then become thin, discoloured and fall out.
After some time, these hairs will often grow back without the need for treatment. In rare cases, the hair loss may develop into a loss of all scalp hair (alopecia totalis) or the entire body (alopecia Universalis).
Lichen planopilaris: This presents with an intensely itchy and red scalp mainly affecting the crown and top of the head. The condition involves inflammation around the hair follicle causing patchy hair loss.
After hair is lost the scarring of the skin makes this condition very difficult to treat.