What Does Insect Bite Mean and Look Like? Pests Vs Non-Biting

A bite is a small red mark on the skin caused by the biting action of an insect.

Also, it's a painful wound caused by the thrust of an insect's probe or stinger into skin.

Multiple Mosquito Bites
Scorpion Sting
Example of Bee Sting

First Aid to Use:

From what helps reduce pain and swelling;

Elevate the arm or leg that get bitten.
Rub skin with hydrocortisone cream(0.5-1.0%) , calamine lotion or a baking soda paste to the bite or sting several times daily until you feel comfortable and the itching go away.
However, take Benadryl, an antihistamine to reduce itching.

When You Should Be Concerned About Insect Bites?

Inside US, Contact GP doctor or just call NHS 111 for advice when:

The symptoms after bite do not resolved within a few days or are getting worse.
You've been getting serious bites on face, or in your mouth or throat, or near your eyes.
The bite becomes big red swollen patches larger than 10cm on skin.
You worried so much about if the bite worsen.

Difference Between Bites and Stings

Sting is the doing and the tool of stinging,

it is a small sharp-pointed organ at the end of the abdomen of bees, wasps, ants, and scorpions, capable of inflicting a painful or dangerous wound by injecting poison.

When venomous insects sting your skin, they feel danger, also they injecting painful toxic venom through their stingers into your blood or skin, and may leave their stinger inside your skin.

In contrast, non-venomous insects do bite, means siphoning your blood as a meal by injecting a syringe-like organ and inject anti-coagulant spit, so they can easily feeding on your blood.

Both Bites and Stings may cause itching and redness, but venomous stings cause painful local allergic reactions with large swelling and big reddish areas like allergies.

Insects That Bite Humans (Biting Insects List)

Also Known as Pest Insects, according to Wikipedia classification;

Adersia
Aedes albopictus
Banded sugar ant
Bat bug
Bed bug
Black fly
Blandford fly
Cat flea
Ceratopogonidae
Chrysops caecutiens
Chrysops niger
Chrysops relictus
Cimex antennatus
Cimex hemipterus
Cimicidae
Culex
Culex annulirostris
Culex erythrothorax
Culex perfuscus
Culex sitiens
Culex tritaeniorhynchus
Culicoides bolitinos
Culicoides imicola
Dasychela
Deer fly
Diachlorus
Diachlorus ferrugatus
Dog flea
Echidnophaga gallinacea
Fire ant
Flea
Haematobia irritans
Highland midge
Horse-fly
Jack jumper ant
Lipoptena cervi
London Underground mosquito
Meat ant
Mosquito
Myrmecia (ant)
Myrmecia nigriceps
Myrmecia nigrocincta
Nosopsyllus fasciatus
Ochetellus glaber
Oriental rat flea
Polyctenidae
Prosimuliini
Pseudopulex
Red imported fire ant
Sandfly
Simuliinae
Simuliini
Simulium
Simulium yahense
Stable fly
Tabanomorpha
Tabanus
Tabanus autumnalis
Tabanus bovinus
Tabanus bromius
Tabanus cordiger
Tabanus darimonti
Tabanus eggeri
Tabanus glaucopis
Tabanus lineola
Tabanus maculicornis
Tabanus miki
Tabanus nigrovittatus
Tabanus quatuornotatus
Tabanus spodopterus
Tabanus sudeticus
Triatoma
Triatoma brasiliensis
Triatoma dimidiata
Triatoma gerstaeckeri
Triatoma indictiva
Triatoma infestans
Triatoma juazeirensis
Triatoma melanica
Triatoma nigromaculata
Triatoma protracta
Triatoma sanguisuga
Triatominae
Trichomyrmex destructor
Western corsair

What is the Pest?

Pests are destructive insects or animals that attacks humans, livestock as well as crops and foods. However some pests are beneficial and eat other harmful pest insects.
Examples: mosquitoes, rodents, and weeds

What Are Bugs?

The Differences Between a Bug And an Insect;

Scientists call it "True bug" if it use a stylet to suck plant juices, Stylet is a mouth shaped like a straw.

True bugs include insects such as leafhoppers, aphids, cicadas, stink bugs, water bugs and yes those pesky bed bugs. They have many of the same parts as other insects in that they have an exoskeleton, segmented bodies, and 6 legs. However, they are different than insects in other groups.
Askabiologist.asu.edu

Insects belong to the class Insecta and they are characterized by three-part bodies, usually two pairs of wings, and three pairs of legs, (e.g., bees and mosquitoes).