An inflammatory process affecting the skin, caused by bacteria, viruses, parasites, or fungi. Examples of bacterial infection include carbuncles, furuncles, impetigo, erysipelas, and abscesses. Examples of viral infection include shingles, warts, molluscum contagiosum, and pityriasis rosea. Examples of parasitic infection include scabies and lice. Examples of fungal infection include athlete's foot, yeast infection, and ringworm.