Localized hair loss can be due to scarring alopecia (causes dent, eg: discoid lupus erythematosus, scleroderma, lichen planopilaris, kerion, metastatic carcinoma, lymphoma, sarcoidosis, prolonged pressure, and cicatricial pemphigus), alopecia areata, tinea capitis (fungal infection), sarcoidosis, follicular mucinosis, bacterial infection, aplasia cutis, burns (including chemical burns due to shampoos, oils or something that causes an allergic reaction), herpes zoster, squamous cell carcinoma, and other such conditions. The skin of the scalp should be biopsied. Please consult a skin specialist regarding this.
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