Which condition can skin develop if proper sanitation is not followed during hair removal?

Inadequate sanitation during hair removal can lead to infections, which is why this is the correct choice. When tools, such as razors, wax applicators, or tweezers, are not properly sanitized, they can introduce bacteria or viruses into the skin. This can result in conditions like folliculitis, which is an infection in the hair follicles, causing redness, swelling, and sometimes pus. Additionally, if the skin barrier is compromised during hair removal, pathogens can more easily breach the skin's defenses, exacerbating the risk of infections.

On the other hand, while hyperpigmentation, dry patches, and allergic reactions are concerns in the context of hair removal, they are not directly caused by poor sanitation. Hyperpigmentation might occur due to irritation or inflammation from hair removal techniques, but it does not stem from a lack of hygiene. Dry patches can result from skin irritation or dehydration but are also not direct consequences of insufficient sanitation. Allergic reactions, meanwhile, may occur due to sensitivity to products used during the hair removal process, like waxes or creams, rather than being specifically linked to sanitation practices.