What type of rashreaction is it when there a red bump in the center white circle bullseye like but not lyme disease itchy and started on my legs are spreading to arms?

It is difficult to diagnose a skin condition without a visual examination. However, the symptoms you described could indicate several different types of skin rashes. It is always best to consult with a medical professional to get a proper diagnosis and appropriate treatment. Here are a few possible causes based on your description:

1. Insect bites/stings: Insect bites, such as from mosquitoes, fleas, or spiders, can cause itchy red bumps with a central white area. These bites are typically scattered and may appear in clusters.

2. Hives (Urticaria): Hives are itchy, raised, red or skin-colored bumps that can appear anywhere on the body, including the legs and arms. They can be caused by various triggers, such as allergies, certain foods, medications, or stress.

3. Ringworm (Tinea): Ringworm is a fungal infection of the skin that can cause red, itchy circular rashes with a raised, scaly border. It commonly affects the legs, arms, and scalp.

4. Allergic reactions: Skin allergies, such as those caused by certain foods, medications, or contact with allergens like poison ivy or laundry detergent, can result in red, itchy rashes with varying patterns.

5. Eczema (Atopic dermatitis): Eczema is a chronic inflammatory skin condition that can cause dry, itchy, red rashes. It commonly affects the face, elbows, knees, and legs, but can also spread to other parts of the body.

It is important to consult with a doctor or dermatologist to determine the exact cause of your rash and receive appropriate treatment. They may perform additional tests, such as a skin biopsy or allergy tests, to confirm the diagnosis. Seeking medical advice is essential to ensure proper management of your skin condition and to rule out any serious underlying causes.