In general, what is the skin disease called?

What are the symptoms?

You are aware there is significantly far more than one skin disease? Aren't you?

Dermatitis is a general term that describes an inflammation of the skin. Dermatitis can have many causes and occurs in many forms. It usually involves an itchy rash on swollen, reddened skin.

Skin affected by dermatitis may blister, ooze, develop a crust or flake off. Examples of dermatitis include atopic dermatitis (eczema), dandruff, and rashes caused by contact with any of a number of substances, such as poison ivy, soaps and jewelry with nickel in it.

3 cancers of the skin are melanoma, basal and squamous cell.

Dermatitis isn't really a disease so you are going to have to be more specific in your question. There's psoriasis, scleraderma, and shingles, among others.