Pimple Or Insect Bite. Fire ants harvester ants blister beetles and centipedes also cause a painful red bump. I do get pimples on my back occasionally and chest and face but this was a wee bit different.

What they look like. Bug bites tend to be itchy painful. There may be minimal itching or swelling according to John Hopkins Rheumatology.
The symptoms of an allergic reaction to an insect sting or bite can include.
A bite from a tick carrying Lyme disease may leave you with a bulls-eye shaped rash involving concentric rings of. Cause of Insect Bite Reaction. It should be borne in mind that only a small part of the insect bites is secondarily infected by bacteria. A tick bite that has not led to an infection may look like a small red circle.