The term may be used synonymously with "volcanic ash." It truly is mined from volcanic ash deposits, or it may be made by crushing rock pumice. Inverse pityriasis rosea normally will cause a rash about the armpits or groin. It really is an atypical kind of pityriasis rosea. Learn more https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/