Dermatology terminology

Attested in English in 1819, the word "dermatology" derives from the Greek δέρματος (dermatos), genitive of δέρμα (derma), "skin" (itself from δέρω dero, "to flay") and -λογία -logia.

Common terms used in the General Dermatology Diagnostic Tool Macules = non-palpable areas of skin change less than 1 cm diameter. Papules = solid elevated lesions less than 0.5 cm diameter. Nodules = solid elevated lesions more than 0.5 cm diameter. Patches = flat lesions more than 1 cm diameter.

What is the difference between a rash and dermatosis?

It may be solitary or multiple

A rash is a widespread eruption of lesions

Dermatosis is a generic term for a disease of the skin

When examining the skin, a dermatologist assesses distribution, morphology and arrangement of skin lesions: their number, size, and colour, which sites are involved, their symmetry, shape, and arrangement