These include damage from cosmetic burns from hot combs, straightening irons, radiotherapy, chemical straightening and also from trauma involving the scalp (such as car accidents or a bad fall). Although rare, permanent hair loss from these methods can either be an immediate bald patch, or cumulative hair loss from repeated damage.

Article
Traumatic & Cosmetic Scarring Alopecia
Permanent, scarring alopecia is a ‘secondary’ cicatricial alopecia and is caused by external damage to hair follicles.
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