INTERTRIGO
intertrigo
(noun) chafing between two skin surfaces that are in contact (as in the armpit or under the breasts or between the thighs)
Source: WordNet® 3.1
Etymology
Noun
intertrigo (uncountable)
(medicine, dated) Chafing or dermatitis occurring between two folds of skin.
Source: Wiktionary
In`ter*tri"go, n. Etym: [L., fr. inter between + terere, tritum, to
rub.] (Med.)
Definition: A rubbing or chafing of the skin; especially, an abrasion or
excoriation of the skin between folds, as in fat or neglected
children.
Source: Webster’s Unabridged Dictionary 1913 Edition