eruption
noun
[ ɪˈrʌpʃ(ə)n ]
• an act or instance of erupting.
• "the eruption of Vesuvius"
• a spot, rash, or other mark appearing suddenly on the skin.
• "irritable skin eruptions"
Origin:
late Middle English: from Old French, or from Latin eruptio(n- ), from the verb erumpere (see erupt).