Trichorrhexis nodosa describes which condition?

Trichorrhexis nodosa describes which condition?

• A. Knotted hair caused by weak hair shafts
• B. Patchy hair loss in round or oval areas
• C. Beaded hair caused by irregular hair growth
• D. Dandruff

Answer: (A)

Trichorrhexis nodosa is a hair shaft disorder where the hair is weak and develops node-like defects along the strand, causing it to look knotted and to break easily at the nodal points. That description fits best with knotted hair caused by weak hair shafts, which is why that option is correct. The other choices describe different conditions: patchy hair loss in round or oval areas points to an autoimmune or fungal type of alopecia, beaded hair describes a beaded or constricted shaft pattern seen in monilethix, and dandruff is scalp flaking rather than a structural hair shaft defect.

Trichorrhexis nodosa is a hair shaft disorder where the hair is weak and develops node-like defects along the strand, causing it to look knotted and to break easily at the nodal points. That description fits best with knotted hair caused by weak hair shafts, which is why that option is correct. The other choices describe different conditions: patchy hair loss in round or oval areas points to an autoimmune or fungal type of alopecia, beaded hair describes a beaded or constricted shaft pattern seen in monilethix, and dandruff is scalp flaking rather than a structural hair shaft defect.