DermNet provides Google Translate, a free machine translation service. Note that this may not provide an exact translation in all languages

Perianal streptococcal dermatitis

Author: Dr Mark Duffill, Hamilton, New Zealand, 2008.

Perianal streptococcal dermatitis — codes and concepts

What is perianal streptococcal dermatitis?

Perianal streptococcal dermatitis is an infectious condition of the skin around the anus in children. It is caused by group A beta-haemolytic streptococcus bacteria.

What are the symptoms of perianal streptococcal dermatitis?

Perianal streptococcal dermatitis presents with sharply demarcated redness, local swelling and itch of the area around the anus. It may be accompanied by inflammation of the vulva and vagina in girls (or end of the penis in boys), pain on passing a bowel motion, constipation, cracks in the anus and discharge of pus and/or blood from the rectum.

What is the cause of perianal streptococcal dermatitis

Perianal streptococcal dermatitis is caused by streptococcal bacteria of the group A beta-haemolytic type.

The same bacterium may be carried in the throat. The bacteria may be passed to other children. However, some children carry the bacteria in the anal and genital area without it causing disease.


A swab for bacterial culture will confirm the diagnosis. A rapid streptococcal test may provide a quicker result.


Oral penicillin for 14 days is usually prescribed. Amoxicillin and clarithromycin are alternatives. A repeat course of antibiotics is sometimes required.

The condition may recur, in which case the treatment may be repeated.

Perianal streptococcal dermatitis

See smartphone apps to check your skin.
[Sponsored content]


Related information



  • Echeverría Fernández M, López-Menchero Oliva JC, Marañón Pardillo R, Míguez Navarro C, Sánchez Sánchez C, Vázquez López P. [Isolation of group A beta-hemolytic Streptococcus in children with perianal dermatitis] An Pediatr (Barc). 2006 Feb;64(2):153-7. Spanish. Pubmed.
  • Herbst R. Perineal streptococcal dermatitis/disease: recognition and management. Am J Clin Dermatol. 2003;4(8):555-60. Review. Pubmed.
  • Spear RM, Rothbaum RJ, Keating JP, Blaufuss MC, Rosenblum JL. Perianal streptococcal cellulitis. J Pediatr. Oct 1985. 107(4):557-9. Pubmed.

On DermNet NZ:

Books about skin diseases:

See the DermNet NZ bookstore