Using dull clippers or scissors can lead to skin irritation after a haircut because these tools do not provide a clean cut. When clippers or scissors are sharp and well-maintained, they efficiently shear the hair without pulling or tugging on the strands. However, dull blades can snag the hair, which may cause discomfort, redness, or irritation to the scalp and skin. Additionally, when clippers leave split ends or frayed hair, this can further contribute to irritation as the hair rubs against the skin.
In contrast, while overusing hair gel and applying too much product can cause buildup and make the scalp feel greasy or lead to clogged pores, these issues are typically related to the application of styling products rather than the haircut itself. Washing hair too often may strip the natural oils from the scalp, leading to dryness or irritation, but it is not directly related to the immediate effects of a haircut. Thus, the presence of dull clippers or scissors is particularly impactful in causing irritation following a fresh haircut.