There is no known reason why bedbugs will bite only one person. Bedbugs usually cluster together at one corner of the bed or on one side of the mattress. They are attracted to the source of warmth and CO2 and will feed on these sources. However, this behavior does not necessarily mean that your bed has a high population of bedbugs.
Bedbugs prefer darker colors like red and black. They search for these colors as these are more secure places. Those who wash before going to bed may not attract the bugs. You may want to use a repellent to help keep bedbugs away. Some repellents include essential oils and everyday substances. Some people may even experience fewer bites while using a repellent.
It is possible to have an infestation of bed bugs if you are allergic to the bugs themselves. Although their bites can be difficult to spot, it is possible to have an allergic reaction. The rash may be mild, or it may be more severe. If you suspect an infestation, you should consult with a doctor.
If you suspect bedbugs, check your mattress for signs. They may be hiding in the seam of your mattress. Some people may think they have bedbugs, but they may only be on one side of the bed. You should also check the headboard for signs of bedbugs.