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You should not see live bed bugs after heat or fumigation treatments, but you may see dead bugs. For chemical treatments, it can take several days for bed bugs to die. However, you may see live bed bugs if they are hiding in areas to avoid insecticides or if they are resilient to the type of treatment used. 

The signs of a bed bug infestation include itchy, red bite marks on the skin and various forms of physical evidence on or near your bed. Look for reddish or rust-colored stains on sheets from crushed bed bugs, as well as small, dark fecal droppings. You might also find the bugs themselves, their tiny eggs, or the pale, molted skins (casings) they leave behind. In some cases, a persistent musty odor may be present. If you notice any of these signs, calling a professional exterminator is the most effective way to handle the infestation.

Exterminators use residual insecticides in either liquid or powder form to kill scorpions. These insecticides are applied directly to visible scorpions and their common hideouts and entryways in a home to kill them and prevent future infestation. Exterminators will also use diatomaceous earth at entryways to slowly kill scorpions that enter a home later.

For a non-chemical bed bug treatment, you can try spraying your mattress with a mixture of essential oils, rubbing alcohol, and water. Pesticide sprays are available, but using them can pose potential health risks to humans and pets—especially if they are not applied correctly. If non-chemicals do not eradicate your bed bug infestation, you should consult a pest control specialist to determine the best course of action.