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Scalp areas that look normal in people with hair loss may still show signs of disease under a microscope.

Hair from people with seborrheic dermatitis is thicker scaled, more damaged, and thinner than healthy hair, and atomic force microscopy can help monitor the condition.

Stress might trigger hair loss in alopecia areata, but more research is needed.

Hair loss can occur about 4 weeks after scalp surgery but usually grows back within 3 months without treatment.

The conclusion is that normal scalp hair counts for Taiwanese people were established, showing age-related differences but not sex or scalp location differences.