1. Reference Standard: 2020 IACS criteria (clinical categories used in study) | |
 Subcategory B3: Typical lesions in a typical distribution and two history features | |
 Subcategory C1: Typical lesions in a typical distribution and one history features | |
 Subcategory C2: Atypical lesions or atypical distribution and two history features | |
 *History features: itch; positive contact history | |
2. Index Tests | |
 A. Simplified criteria  Typical lesions in a typical distribution, with or without itch | |
 B. Alternative simplified criteria 1 (ASC1)  At least one of:  i. Typical lesions in a typical distribution, with or without itch  ii. Atypical lesions in a typical distribution, with itch | |
 C. Alternative simplified criteria 2 (ASC2)  At least one of:  i. Typical lesions in a typical distribution, with or without itch  ii. Atypical lesions in a typical distribution, with or without itch | |
 D. Alternative simplified criteria 3 (ASC3)  Itch | |
 E. Alternative simplified criteria 4 (ASC4)  Itch and positive contact history |