For most people they are just an extremely irritating annoyance rather than a danger. But because bedbugs inject both a anaesthetic and a coagulant into everybody before they suck the person's blood and while the person is usually in a deep sleep, one danger is that when the anaesthetic effect wears off the itch can feel so irritating that the person may scratch where the wound in their limb is frantically to get relief either while still asleep or after waking. Scratching a wound particularly if the person's finger nails are not clean could inject dirt into the bloodstream. Also about one person in five is apparently allergic to the substances the bedbug injects into them and this can cause more dangerous side effects such as swelling, chronic or acute rashes or in rare cases broncho-spasm or anaphylactic shock. Also if a bed is very heavily infested so the sleeper is bitten by a large number of bedbugs while asleep successively over a prolonged period, anaemia can occasionally be caused, which can lead to fatigues and headaches and in very isolated cases breathlessness and pain in the centre of the chest. But such instances are the exception not the rule.
some bedbugs can leave people with rashes
Yes they do and they will then they will itch and then scab over.
If you don't have bedbugs your bites are not from bedbugs, or you are being bitten while you are somewhere else. Bedbug bites are commonly confused with flea bites and mosquito bites. There is also a skin rash called Pityriasis Rosea that may be caused by a virus and that may look like Bed Bug bites at first. If you think you have a Bedbug bite go to a doctor, have a specialist inspect your home for bedbugs, or research about what Bedbug bites look like. Bedbugs are not known to transmit diseases or parasites to people, but their bits can be painful and worrisome.
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Flea bites can be dangerous to babies. The saliva of fleas contains anticoagulants which can cause severe infections in infants.
Generally chigger bites are not dangerous. They are more of an annoyance. If the area becomes discolored or painful than an infection could be on the horizon.
Any snake bites hurt, it's the poisonous ones that are dangerous though
That depends directly on the individual that was attacked. The resulting severity of the bite is different with each person. When a BedBug "bites" you what happens is the nasty little creature secretes a couple of chemicals at the point of the bite. One is ananesthetic that stops you from feeling the pain of the bite and waking up. The other is an anti coagulant to make sucking your blood easier for them. How each individual reacts to those chemicals is what determines the severity of the bite and the time it will take to go away. What you see as a bite is an allergic reaction. In some cases that reaction can be very dangerous and has even been known to bring on asthma attacks.
YES
First, find the source of the bedbugs and get rid of it! The bites will eventually heal and go away. Calamine Lotion (used for poison ivy, may alleviate the itching. Just like any would, they have to heal.
It really depends how many bites you have, and if you're allergic to them then yes a flea is dangerous.
If you are experiencing several bumps all over your legs, it could be boils; seek medical attention.
Any snake bites hurt, it's the poisonous ones that are dangerous though