What are major disease associated with the integumentary system?

The Integumentary System is composed of three main organ's; The Hair, Skin, and Fingernails. The goal of the Integumentary system is to act as the first line of defense against pathogens and environmental factors. However the relative exposure to the outside world means that the Skin is open to many possible dangers.

Malignancies (Cancer's) are some main danger's. Two very common skin malignancies are Melanoma's (Cancer's that originate in Melanocytes; the cells that produce Melanin)  and Basal Cell Carcinoma's (Cancer's that originate from the Epidermis's; Stratum Basal).

Additionally infections such as Cellulitis, dermatitis or Staph infections can be common as well. 

Acne Vulgaris and Rosaccea are relatively common iwhen growing. Athlete's foot; a fungal infection that eats at the skin of the feet, is common in activ individuals. 

These are but some of the numerous illnesses that affect the skin.