Skin is the large organ that covers and protects your body.Your skin has many functions. It works to:

• Hold in fluid and prevent dehydration.
• Help you feel sensations, such as temperature or pain.
• Keep out bacteria, viruses and other causes of infection.
• Stabilize your body temperature.
• Synthesize (create) vitamin D in response to sun exposure.

The most common types of skin diseases

• Acne, blocked skin follicles that lead to oil, bacteria and dead skin buildup in your pores.
• Alopecia areata, losing your hair in small patches.
• Atopic dermatitis (eczema), dry, itchy skin that leads to swelling, cracking or scaliness.
• Rosacea, flushed, thick skin and pimples, usually on the face.
• Vitiligo, patches of skin that lose pigment.

Causes of skin diseases

 Certain lifestyle factors can lead to the development of a skin disease. Underlying health conditions may affect your skin, too. Common causes of skin diseases include:

• Bacteria trapped in your pores or hair follicles.
• Conditions that affect your thyroid, kidneys or immune system.
• Contact with environmental triggers, such as allergens or another person’s skin.
• Genetics
• Medications, such as the ones that treat inflammatory bowel disease (IBD).
• Viruses
• Diabetes