Insect bites.

Signs and symptoms · Red lumps in the skin. The lumps usually appear in minutes after the bite or sting. Some don't appear for 6 to 12 hours. Skin reactions fall into 2 kinds: · A toxic reaction with pain and sometimes fever, such as from bee stings. · A toxic reaction with itching due to the body’s release of histamine at the site of the bite, as from mosquitoes. RISKS INCREASE WITH · Areas with heavy insect infestations. · Warm weather in spring and summer. · Perfumes, colognes.