Pyoderma means any skin disease that is pyogenic. These include superficial bacterial infections such as impetigo

Impetigo

Impetigo is a highly contagious bacterial skin infection most common among pre-school children. People who play close contact sports such as rugby, American football and wrestling are also susceptible, regardless of age. Impetigo is not as common in adults. The name derives from the Latin impetere...

, impetigo contagiosa, ecthyma

Ecthyma

-Definition and Introduction:Ecthyma is an ulcerative pyoderma of the skin caused by bacteria such as Streptococcus pyogenes, Pseudomonas and Staphylococcus aureus. Because ecthyma extends into the dermis, it is often referred to as a deeper form of impetigo....

, folliculitis

Folliculitis

Folliculitis is the inflammation of one or more hair follicles. The condition may occur anywhere on the skin with the exception of the palms of the hands and soles of the feet.- Causes :...

, Bockhart impetigo, furuncle, carbuncle

Carbuncle

A carbuncle is an abscess larger than a boil, usually with one or more openings draining pus onto the skin. It is usually caused by bacterial infection, most commonly Staphylococcus aureus. The infection is contagious and may spread to other areas of the body or other people...

, tropical ulcer

Tropical ulcer

Tropical ulcer is a lesion occurring in cutaneous leishmaniasis. It is caused by a variety of microorganisms, including mycobacteria...

, etc. Autoimmune conditions include pyoderma gangrenosum

Pyoderma gangrenosum

Pyoderma gangrenosum is a disease that causes tissue to become necrotic, causing deep ulcers that usually occur on the legs. When they occur, they can lead to chronic wounds. Ulcers usually initially look like small bug bites or papules, and they progress to larger ulcers. Though the wounds...

. Pyoderma affects more than 111 million children worldwide making it one of the three most common skin disorders in children along with scabies

Scabies

Scabies , known colloquially as the seven-year itch, is a contagious skin infection that occurs among humans and other animals. It is caused by a tiny and usually not directly visible parasite, the mite Sarcoptes scabiei, which burrows under the host's skin, causing intense allergic itching...

 and tinea

Tinea

Tinea is a general term used to describe skin mycoses. The term ringworm is even less precise, but is usually considered a synonym.It is sometimes equated with dermatophytosis, and it is true that most conditions identified as "tinea" are members of the imperfect fungi that make up the dermatophytes...

.