The skin is a surface barrier to most diseases. It is waterproof and it if it cut, the hole is sealed by a blood clot that then forms a scab to help protect you while it heals. It is very dry and acidic - conditions that prevent the growth of many bacteria and fungi.
Some fungi can cause death to you and also, they can grow on tree's and if you cut yourself and you touch fungi it can grow inside you.
Mostly skin diseases.
Ringworm
mumps
its plasmic skin
By breaking down the skin or surface area they live on. This causes damage that is the sign or symptom of the disease the fungi causes. Fungi are plants, they do this with their roots.
Fungi causes some of the most irritating skin diseases and the it also causes the bread mould.
Fungi are organisms which grow on decaying matter and causes skin diseases like ringworm and athlete's foot .
Skin diseases can be caused by viruses, fungi, bacteria, or parasites.
I'm assuming you are referring to the growth that is visible to your eyes and not under a microscope. If you cut a spot of mold or fungus in half, you will have two spots of mold or fungi.
A dermatome is an instrument to cut skin.