LESIONS

The definition of a lesion is “something abnormal.” 

1˚ skin lesions refers to the first rash.

2˚ skin lesions are modifications of the 1˚ lesions (if it cracks, or dries out). Eg, scales, crusts, fissures, ulcerations. 

Macule - flat discoloration

Patch - flat lesion WITH secondary change

Papule - small bump

Nodule - big bump

Plaque - plateau

Maculopapular Rash - most common rash presentation. Common in drug reactions, scarlet fever, syphilis, and many viruses.

Morbilliform - measles-like appearance