Other rare adult causes
- Hypereosinophilic syndrome
- Crusted scabies, dermatophyte infection
- Lichen planus, graft versus host disease, sarcoidosis
- Autoimmune connetive tissue disease (acute cutaneous lupus erythematosus, subacute cutaneous lupus erythematosus, juvenile dermatomyositis)
- Inherited ichthyoses: present from birth/early infancy
- Primary immunodeficiencies
- Mastocytosis
- Langerhans cell histiocytosis
- Other T-cell hematologic malignancies