15 citations
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December 2016 in “Journal of The American Academy of Dermatology” Exclamation mark hairs suggest early scalp disease, while white dots indicate it's chronic.
33 citations
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September 2012 in “Australasian Journal of Dermatology” Chemotherapy can cause hair changes similar to alopecia areata, which might lead to misdiagnosis.
April 2024 in “Journal of cosmetic dermatology” Children with alopecia areata have more exclamation mark hairs and fewer yellow dots than adults.
January 2021 in “International journal of dermatology, venereology and leprosy sciences” Trichoscopy shows black dots, yellow dots, and empty follicles are common in Alopecia Areata, with broken and exclamation mark hair as typical patterns.
89 citations
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December 2010 in “The Journal of Dermatology” The conclusion is that an algorithm using trichoscopy helps diagnose different types of hair loss but may need updates and a biopsy if results are unclear.