What may indicate that a cosmetologist failed to apply protective cream during a perm?

The presence of red and sensitive areas on the neck and hairline is a clear indicator that a cosmetologist may not have applied protective cream prior to the perm treatment. Protective cream is used to shield the skin from the harsh chemicals involved in perming solutions, which can cause irritation or chemical burns. If these protective measures are neglected, the skin can react adversely to the chemicals, resulting in redness and sensitivity in exposed areas.

The other situations may arise due to different causes unrelated to the application of protective cream. For instance, dry hair could be a result of the hair's health prior to the treatment or an indication that the perm solution was too strong, but it does not specifically denote a failure to apply protective cream. Frizz after processing often results from improper perm technique or inadequate aftercare, rather than indicating missed protective measures. A headache is also not a direct consequence of not applying protective cream and could stem from various factors, such as stress or exposure to strong odors from the perm solutions. Hence, the red and sensitive areas stand out as the most telling sign of a lack of protective barrier during the procedure.