Understanding how hair types differ and develop helps explain what replaces Lanugo. Lanugo is the fine, soft hair that covers a fetus. After birth, this hair is shed and typically replaced by vellus hair, which is short, fine, and non-pigmented. Terminal hair, by contrast, is longer, thicker, and pigmented, and canities refers to gray or white hair, not a replacement for Lanugo. So the term for short, fine, non-pigmented hair that replaces Lanugo is vellus.

Pheomelanin produces reddish-yellow tones, and the location of pigment within the hair affects what we see on the surface. When pheomelanin is concentrated near the outermost layer, the red-toned pigment is more visible on the cuticle, so the hair appears red. Blue or green tones don’t come from pheomelanin, and having no pigment near the surface wouldn’t produce a red hue, so this particular arrangement yields a red appearance.

Alopecia refers to hair loss. The best choice states that alopecia is excessive hair loss and that the most common form is androgenetic alopecia. Androgenetic alopecia, also known as pattern hair loss, arises from a mix of genetic predisposition and hormonal factors, and it is the form seen most frequently in both men and women. It’s distinct from conditions involving color changes, nail changes, or fungal infections, which are not what alopecia describes. In real life, men often show a receding hairline and thinning at the crown, while women usually experience diffuse thinning on the top of the scalp.

Symmetry in a haircut is best judged from a neutral, real-time view of the head with controlled hair tension. Have the client look straight ahead, use a mirror so you can compare both sides from the same perspective, and comb the hair to apply consistent tension before you assess. This setup shows true length and shape as the hair falls and moves with the scalp, making it easier to spot imbalances and even out both sides. Using just one mirror without the client limits what you can see and can lead to a skewed judgment. Asking the client to look to the side changes head position and perspective, which makes it harder to gauge true symmetry. Tying the hair up and measuring with a ruler isn’t practical during a haircut and doesn’t reflect how hair sits in natural tension and fall. The combination of forward-facing position, a mirror reference, and controlled tension gives the most accurate, live indication of evenness.