Re: itchy bump....
Hello - there is a wide variety of parasites that could be causing this bump. Most parasite eggs attach themselves to one part of the body to hatch - they then grow into larvae which travels to a different part of the body to grow even bigger - they then travel to yet another part of the body to live and reproduce as mature adults - and the cycle starts over again. Your bump could be a place where the larvae go to in order to grow bigger. A lot of parasites have a life cycle of 30 days and this could very well be when the larvae are migrating out of their "hidey hole" and going to their permanent home. Here are 2 axamples from the website:
STRONGYLOIDES STERCORALIS – this is the most unusual of all of the parasites known to man. They can live with or without a host. The females can reproduce without a male. They infect the skin, then migrate to the lungs where they are coughed up and swallowed by the host. They then settle into the small intestine where they mature and reproduce.
HOOKWORMS – are also called “Necator Americanus” which means the American Murderer. They come from contaminated food and water. The eggs hatch in the intestines then migrate to the lungs through the bloodstream where they are coughed up and swallowed. They then travel back to the small intestine to reproduce. In the lungs they can cause pneumonia . In the intestines they hook themselves into the intestinal walls where each one drinks up to 1cc of blood per day causing bleeding and tissue death, not to mention anemia weakness. Hookworms from dogs and cats penetrate human skin and stay there causing skin problems and rashes including edema. (We get these from pets licking us or us petting or grooming them.) Hookworms also cause asthma, eye pain, insomnia, and dry skin and hair.