This past July (2014) I was attacked by mosquitoes after Leon and had to buy a heavy duty repellent at a pharmacy in Spain. The pharmacist examined my bites because I had swollen skin, eyes, really, really bad. She told me I had a very strong allergic reaction to the mosquito species that got me called the "Mosquito Tiger", alive and well that season. It was not pretty. I still have marks, but it did not prevented me at all from walking. It just wiped out my appetite for 3-4 days. I kept the bites clean with alcohol, applied an anti-itching cream, wore the repellent, took anti-histaminics, and was fine. Sounds worse than what it was... Do not hesitate to go into a pharmacy along the Camino and ask for medical advice. I find the pharmacists in Spain, in general, are incredibly knowledgeable and well prepared.