Which condition is characterized by the presence of excess dead skin on the surface of the nails?

The condition characterized by the presence of excess dead skin on the surface of the nails is hyperkeratosis. This condition involves the thickening of the outer layer of the skin, which can lead to an accumulation of dead skin cells over and around the nails. This buildup can result in both aesthetic concerns and potential discomfort, as it might affect the area surrounding the nails, including the cuticles.

In the context of nail care, recognizing hyperkeratosis is vital for nail technicians, as they may need to manage this condition during nail treatments. Proper sanitation and possibly special techniques or products may be required to safely observe and treat nails affected by hyperkeratosis.

Other conditions mentioned offer different characteristics; for example, aging may cause various changes in the nails but does not specifically refer to an accumulation of dead skin. Onychorrhexis describes split or brittle nails rather than dead skin accumulation. Psoriasis can involve the nails but is primarily an autoimmune condition affecting skin and can lead to pitting and discoloration rather than just excess dead skin. Understanding these distinctions helps in providing effective nail care and treatments.