This is a great question. It is very important for you to make an appointment with your primary care doctor
to discuss your symptoms and have a full history and physical. Although it is difficult to determine what could be the exact cause of your symptoms without visualizing the rash, from your description the most likely cause of non itchy raised bumps with a central dimple would be molluscum contagiosum. This is a viral skin condition that is often described as pearl-like bumps. It most often affects children but can affect adults that have been directly exposed to the virus or those that are immunodeficient. Although they are usually associated with itch, it is still possible that your bumps are caused by bug bites, hives
, or an allergic reaction. If you have a history of multiple sunburns or you have a family history of skin cancer, it is possible that these could be basal cell carcinomas. Again, it is very important that you make an appointment with your doctor as soon as possible to be evaluated and obtain a correct diagnosis and appropriate treatment. In the meantime, do not scratch or try to pop the bumps as this can cause scarring or infection.