Sandflies can be a real problem on all of the Seribuat islands, including Pulau Tioman. These little pests, looking like tiny fruit flies with black bodies and white wings, suck blood and cause an extremely itchy lump, which may become a nasty blister if scratched. The effectiveness of various treatments and deterrents is much debated; the general feeling is that short of dousing yourself all over with insect repellent, covering up completely or hiding out in the sea all day long, there’s not much you can do. You may find that Tiger Balm, available at any pharmacy, can reduce the maddening itch and help you sleep. If you are able to take them, antihistamines also provide some relief.