Although I had never had PF prior to my first Camino, I got a very rude introduction a few weeks south of Reims. I went to a doctor in Limoges, who made the standard rest and ice recommendations, but also advised me to get some NIFLUGEL (2.5% Niflumic Acid gel) at the pharmacy. No Rx needed...
Yikes! First time I've ever about this. One tip to consider is to run a lint roller over your clothes and/or legs. That will grab any of them, including tiny ones you might not see.
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