Puerto Rico does have a species of sand flea, locally called "maje". They are very small, smaller than gnats, but unlike gnats they bite. The bite is felt instantly and causes a small irritation at the side of the bite. The bite will cause intense itching for about 2-3 weeks. Its important to avoid scratching the affected area. Treat by blotting rubbing alcohol over the affected areas to promote the drying of the site. Then apply a topical insect bite treatment to further promote healing.
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Yes, notably on all of the coastal beaches. During the day they were not noticed; after nightfall they came out and bit relentlessly. Wearing insect repellent with deet prevented the biting. 'Deep woods OFF' worked well for us.