Been there, done that and it's not a pleasant thing to have. Walked in grass barefoot. Sunny sand isn't a problem at all. Fortunately I had heard about it on this board and went to the doctor with the name of the proper medication but its was a long time ago and I don't remember what it was. I remember it being the same type medication you give a dog for worms. Just a couple of pills a day for a couple of days. The doctor thought it was so interesting that he brought in the other two doctors at the clinic to see it. The parasites leave a trail where they have been, up one toe down another. Itches like hell. Wasn't a costly fix, not $4,000 US. It did take a day to get it because it isn't stocked in most parts of the country. The doctor researched it and you can get the same parasite in the most tropical parts of the US, mainly Florida. We never wear or carry shoes while on the beach so we don't go into extremely shady or any grassy areas barefoot. It only happened to me one time in 26 years.