Approach
- History
- SOCRATES
- Family/friends with similar rash
- Medication
- Household products
- Examination
- Investigation
Differential Diagnosis
- Roseola infantum (exanthema subitum)
- Pityriasis rosea
- Scarlet fever
- Impetigo
- Erythema infectiosum
- Molluscum contagiosum
- Tinea infection
- Atopic dermatitis
| Pruritic | Non-pruritic |
| Pityriasis rosea | Roseola infantum |
| Atopic dermatitis | Scarlet fever |
| Erythema infectiosum | |
| Molluscum contagiosum | |
| Tinea infection |
Distribution
- Erythematous exanthems that tend to start on the face
- Measles
- Rubella
- Erythema infectiosum
- Erythematous exanthems that tend to start on the trunk
- Roseola
- Scarlet fever
- Unilateral laterothoracic exanthem
- Papulo-vesicular exanthems
- Chickenpox (syn. varicella)
- Gianotti-Crosti syndrome
- Exanthems of the extremities
- Hand, foot and mouth disease
- Papular-purpuric gloves and socks syndrome
Roseola Infantum (Exanthema Subitum)
- Herpsevirus 6 and 7
Pityriasis Rosea
- Herpesvirus 6 and 7
Molluscum Contagiousm
- Poxvirus
Erythema infectiosum
- Parovirus B19
Scarlet fever
- Group A Strep
- Staphlococcus pyogenes
Impetigo
- Staphylococcus
- Bullous
- Non-bullous (crusted)
Discussion