What does it means to have itchy raised skin bumps on anus that gone and return every time? itch , like mosquitos bumps

Get it checked: It's difficult to say what your problem could be without visualization of the rash. It's best to follow up with a provider so they can evaluate your condition and determine it's seriousness or lack there of.

Skin bumps: The bumps can be anything. Allergy, herpes, irritation of some kind. This needs to be addressed by a medical provider.