The Collaborative International Dictionary
Ecthyma
Ecthyma \Ec*thy"ma\, n.; pl. Ecthymata. [NL., fr. Gr. ?
pimple, fr. ? to break out.] (Med.)
A cutaneous eruption, consisting of large, round pustules,
upon an indurated and inflamed base.
--Dunglison.
Wiktionary
ecthyma
n. An ulcerative pyoderma of the skin, caused by bacteria.
Wikipedia
Ecthyma
Ecthyma is a variation of impetigo, presenting at a deeper level of tissue.
It is usually associated with Group A (beta-hemolytic) Streptococcus (abbreviated GAS).