I can’t diagnose for sure without seeing it, but “lines of red, very itchy bumps” on one side often point to a few common causes:
🐜 1. Insect bites (very common)
- Bedbugs, fleas, or mosquitoes can leave clusters or lines of itchy red bumps
- Often appear on areas exposed during sleep (side, arms, back)
- Itch a lot and look inflamed
🌿 2. Allergic contact rash
- From something that touched the skin (detergent, fabric, plant, new soap)
- Can appear in streaks or patches
- Usually itchy rather than painful
⚠️ 3. Shingles (important to rule out)
- Usually on one side of the body only
- Starts with burning/tingling → then a rash
- Can form clusters or a band-like pattern
- Often painful, but can also itch
👉 This one needs early treatment, so don’t ignore it if symptoms fit
🦠 4. Skin infection (less likely if just itchy)
- Bacterial infections tend to be painful, warm, spreading, sometimes with fever
🚨 When to seek medical care urgently
- Rash is painful or burning (possible shingles)
- Rapidly spreading or getting worse
- Fever or feeling unwell
- Blisters, pus, or severe swelling
👍 What you can do now
- Avoid scratching (prevents infection)
- Use a cool compress
- Try an over-the-counter antihistamine or soothing lotion (like calamine)
- Check bedding/clothes for possible insect exposure
🧠 Bottom line
👉 Linear itchy bumps = often insect bites or contact reaction
👉 But one-sided, band-like rash → consider shingles and get checked quickly
If you can describe more (pain vs just itch, blisters or not, when it started), I can help narrow it down further.
