- Common
- Allergy to food or drug
- Insect bites or stings
- Antibiotic, anticonvulsant, or allopurinol adverse reaction
- Chemotherapy
- Enterovirus and echovirus infection
- Fifth disease (erythema infectiosum)
- Roseola infantum (sixth disease)
- EBV infection (infectious mononucleosis)
- Cytomegalovirus infection
- Scarlet fever
- Uncommon
- Toxic epidermal necrolysis or Stevens-Johnson syndrome
- Drug reaction with eosinophilia and systemic symptoms (DRESS)
- Erythema multiforme
- Systemic hypersensitivity syndrome
- Acute HIV-seroconversion exanthema
- Acute hepatitis B virus infection
- Acute hepatitis C virus infection
- Rubella (German measles)
- Measles (rubeola)
- Meningococcus
- Staphylococcal scalded skin syndrome
- Toxic shock syndrome
- Rocky Mountain spotted fever or Mediterranean spotted fever
- Acute graft-versus-host disease (aGVHD)
- Kawasaki disease (mucocutaneous lymph node syndrome)
- Juvenile-onset or adult-onset Still disease
- Secondary syphilis
