5 Most Common Skin Disorders ========================================================================= Almost everyone has known the horror of waking up to a glaring-red zit. Acne is the most common skin condition, but it's usually the least severe. Others can be equally embarrassing -- and some can even be life-threatening. Because skin is the largest body organ, the effects of its disorders are as psychological as they are physical. Acne, eczema, seborrheic dermatitis, skin cancer and psoriasis are the five most common skin disorders, says Dr. Macrene Alexiades-Armenakas, assistant clinical professor at Yale University School of Medicine. 1. Acne Acne is a skin disorder that causes pimples when the passageway that connects the skin’s pores to the oil glands becomes clogged. Acne, which appears most often on the face, neck, shoulders, chest and back, can come in many forms. Whiteheads and blackheads are the most commonly known; nodular and cystic acne are...