Do not pull out stingers as this will force the remaining toxin into you. Use the sharp edge of a knife or credit card to scrape them off. Ammonia or urine will deactivate the toxin. Mud or baking soda slurries will draw the toxin out. It is accompanied by high fever, headache and aching joints.
Additional symptoms can include red skin splotches and sensitivity of the eyes to strong light.
It is unpleasant but not usually dangerous. Aspirin exacerbates the tendency of Dengue Fever to cause hemorrhaging. You are not likely to contract Dengue in the forest because the population of hosts is too low to support an epidemic. Most of the researchers who contracted Dengue probably picked it up in San Juan, Carolina, or Fajardo. If you are going where there are lots of people, especially in the daytime, protect yourself from mosquito bites.