A petechia (; : petechiae) is a small red or purple spot (< 3 mm in diameter) that can appear on the skin, conjunctiva, retina, and mucous membranes which is caused by haemorrhage of capillaries. The word is derived , of obscure origin.
- , a skin-scraping treatment in traditional Chinese medicine
- High-g training
- Hickey
- Asphyxiation
- Choking game
- Oral sex
Non-infectious conditions
- Vitamin C deficiency, scurvy
- clotting factor deficiencies – (Von Willebrand disease)
- Hypocalcemia
- Idiopathic thrombocytopenic purpura
- Coeliac disease
- Aplastic anemia
- Lupus
- Kwashiorkor or marasmus – Childhood protein-energy malnutrition
- Erythroblastosis fetalis
- Henoch–Schönlein purpura
- Kawasaki disease
- Schamberg disease
- Ehlers–Danlos syndrome
- Sjögren syndrome – Petechial spots could occur due to vasculitis, an inflammation of the blood vessels. In such a case immediate treatment is needed to prevent permanent damage. Some malignancies can also cause petechiae to appear.
- Radiation
- Fat embolism syndrome
Infectious conditions
- Babesiosis
- Bolivian hemorrhagic fever
- Boutonneuse fever
- Chikungunya
- Cerebral malaria
- Congenital syphilis
- Crimean–Congo hemorrhagic fever
- Cytomegalovirus
- Dengue fever
- Dukes' disease
- Ebola
- Endocarditis
- Hantavirus
- Infectious mononucleosis
- Influenza A virus subtype H1N1
- Marburg virus
- Neisseria meningitidis
- Rocky Mountain spotted fever
- Scarlet fever
- Streptococcal pharyngitis – Petechiae on the soft palate are mainly associated with streptococcal pharyngitis, and as such it is an uncommon but highly specific finding.
- Typhus
Forensic science
Petechiae on the face and conjunctivae are unrelated to asphyxiation or hypoxia. However, the presence of petechiae may be used by police investigators in determining whether strangulation has been part of an attack. The documentation of the presence of petechiae on a victim can help police investigators prove the case. Petechiae resulting from strangulation can be relatively tiny and light in color to very bright and pronounced. Petechiae may be seen on the face, in the whites of the eyes or on the inside of the eyelids.