https://www.mayoclinic.org/diseases-conditions/hair-loss/multimedia/patchy-hair-loss-alopecia-areata/img-20006441
Patchy hair loss (alopecia areata) - Mayo Clinic
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https://pure.psu.edu/en/publications/the-clinical-picture-patchy-hair-loss-on-the-scalp/
The clinical picture: Patchy hair loss on the scalp - Penn State
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