External parasites are insects that require blood to survive.
The environment Centre can give advice on external parasites by phone: Residential health advice: tel. +358 9 310 15000 (Mon, Wed-Fri: from 9 a.m. to noon, Tue from 9 a.m. to 3 p.m.)
This page shows the most common external parasites. By clicking the image, you can see the info page of the insect in question.