If our skin is made up of dead cells, what is dead skin made up of?

pretty self explanatory. i was taught in biology that the outer layer of our skin is made up of dead cells. well, what is dead skin made up of?
If our skin is made up of dead cells, what is dead skin made up of?
All epidermal cells are basically dead cells that have been filled with keratin. Therefore dead skin, as well as "attached" skin is mostly made of keratin.
If our skin is made up of dead cells, what is dead skin made up of?
Dead skin is made up of a larger amount of dead cells? Unsure