The plural form of acne; multiple instances or types of acne conditions or breakouts.
Direct plural of 'acne,' which comes from Greek 'akne' (possibly meaning 'point' or 'peak'). The singular 'acne' was Latinized in medical use, and 'acnes' follows standard Latin pluralization.
Interestingly, most English speakers treat 'acne' as uncountable (you say 'I have acne,' not 'I have acnes'), but dermatologists use 'acnes' when discussing different types or presentations of acne in medical literature!
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