Final answer:
Excessive chemical hair lightening and excessive friction created by backcombing can cause various hair conditions, such as alopecia, monilethrix, ringed hair, and pilica polonica.
Step-by-step explanation:
Excessive chemical hair lightening or excessive friction created by backcombing can cause various hair conditions, such as alopecia, monilethrix, ringed hair, and pilica polonica.
Alopecia is a condition characterized by sudden hair loss, which can be caused by chemical damage to the hair follicles. Monilethrix is a rare genetic condition that results in weak and brittle hair, and excessive hair manipulation can worsen the symptoms. Ringed hair refers to a condition where the hair appears to have alternating bands of light and dark color, which can be caused by chemical treatments. Lastly, pilica polonica is a condition where the hair becomes matted and tangled due to excessive manipulation, such as backcombing.
To prevent these hair conditions, it is important to avoid excessive use of chemical hair treatments and to minimize friction and manipulation of the hair.