Perianal cellulitis, also known as perianitis or perianal streptococcal dermatitis, is a bacterial infection affecting the lower layers of the skin (cellulitis) around the anus. It presents as bright redness in the skin and can be accompanied by pain, difficulty defecating, itching, and bleeding. This disease is considered a complicated skin and soft tissue infection (cSSTI) because of the involvement of the deeper soft tissues.Perianal cellulitis is most commonly caused by group A beta-hemolytic streptococcus bacteria (Streptococcus pyogenes), which resides normally ("in small numbers") in the human throat and on the human skin. Other less common causes may include infection with group B beta-hemolytic streptococci (Streptococcus agalactiae), a bacteria found in the human vagina of some, or Staphylococcus aureus, a common component of the bacterial community in the human nose and/or skin.Perianal cellulitis occurs mainly in male children between six months and 10 years of age, however, there are documented cases of perianal cellulitis in adults as well. Oral antibiotics are the first line treatment for perianal cellulitis and may be used in combination with topical antibiotics. Since the infection occurs within the deeper layers of skin, using a topical treatment by itself may not be effective. In about 20% of cases, recurrence of perianal streptococcal dermatitis infection occurs within 3.5 months. Routine hygiene practices should also be encouraged in children and adults in order to reduce the risk of recurrent infection. Signs and symptoms
Perianal cellulitis manifests as multiple symptoms that are inconsistent with a systemic disease.
PM is an adult disease, usually emerging after the age of twenty. PM and DM are more common in females, more common in Caucasians, and least common in Asians. At any given time, about 35.5 people per million have IBM; it emerges after the age of 30 (usually after 50), and may be more common in males. References


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