Terminology for morphology: macule, patch, papule, plaque, vesicle, bulla, pustule, nodule, cyst, crust, scale, lichenification, erosion, ulcer, wheal

Approach to rashses:

Step 1: describe morphology.

Step 2: describe distribution and configuration.

Step 3: consider which skin layers are involved.

Step 4: apply information to clinical context and story.

Examples: flat or raised, size, color, shape, texture, configuration, distribution

References: AAD Basic Dermatology Curriculum, Dermatology by Bolognia et. al., Lookingbill and Mark's Principles of Dermatology, First Aid USMLE Step 1 2020, First Aid USMLE Step 2 CK