Flat and painless thickened portion of epidermis consisting of mass of horny, keratotic cells formed by local pressure or friction found on palm or undersurface of foot is called:

Correct option is D

Ans. (d) Sol. A callus is a thickened area of skin that forms due to repeated friction or pressure, commonly found on the palms or the undersurface of the feet. It is typically painless and does not have the wart-like growth associated with plantar warts.
Explanation of each option:
· (a) Plantar warts – Incorrect. Plantar warts are caused by a viral infection (HPV) and are typically raised, painful, and may have black dots (clotted blood vessels) in them.
· (b) Corns – Incorrect. Corns are similar to calluses but are usually smaller, raised, and often more painful. They form on areas where there is pressure, often between the toes.
· (c) Athlete's foot – Incorrect. Athlete's foot is a fungal infection that causes itching, redness, and peeling of the skin, not thickened skin from pressure or friction.
· (d) Callus – Correct. A callus is a thickened, protective layer of skin that forms from prolonged pressure or friction, especially on the palms and feet.