How long does it take for hair to grow back after being burned off by fire?

Generally, if the scalp is not damaged after hair has been burned by fire, new hair will gradually grow back within 1–3 months and return to its original length in 6–12 months. However, if the scalp is injured, regrowth may take more than 6 months or even longer. If there are any concerns, it is advisable to seek medical advice early. The detailed analysis is as follows:

When the scalp is undamaged, hair follicles function normally and hair regrows according to its natural growth cycle. Hair typically grows about 1 cm per month. Since burning only damages the hair shaft while leaving the follicles intact, fine vellus hair will begin to appear on the scalp within 1–3 months, gradually becoming thicker and darker, reaching previous length in 6–12 months. During this period, maintaining scalp cleanliness is essential to provide a healthy environment for hair follicles.

When the scalp is injured, hair follicles may be temporarily or permanently damaged, significantly slowing hair growth. If burns cause redness, swelling, or blisters on the scalp, the follicles enter a repair phase, and regrowth may not occur until after 6 months. In cases of severe burns that destroy hair follicles, localized hair loss may develop. In such situations, medical evaluation is necessary to determine whether medical interventions are needed to assist follicle recovery.

After hair has been burned, avoid frequent perming, dyeing, or using harsh shampoo products. If the scalp is broken or wounded, apply prescribed ointments as directed by a doctor to prevent infection. If no new hair growth is observed over an extended period, seek timely medical examination to assess follicle condition and avoid delaying appropriate intervention.