I can’t diagnose it from text, but I can help you sort out the most likely causes—and one in particular matters because of timing.
Most important possibility to consider: shingles
The pattern you describe—“lines of red bumps on one side of the body that itch and look inflamed”—can fit Herpes Zoster.
Typical features:
- Appears on one side only (not both sides)
- Looks like a stripe or band
- Starts as itching, tingling, or burning
- May turn into clusters of bumps or blisters
- Can become painful or very sensitive
Shingles happens when a dormant virus reactivates along a nerve. It’s not usually dangerous, but it should be treated early (ideally within 72 hours of rash starting) because antiviral medicine can reduce severity and complications.
Other possible causes
1) Allergic/contact reaction
- From soap, detergent, clothing, plants, or chemicals
- Usually very itchy, red, and irritated
- Often less “striped along one side,” but can look linear if something brushed the skin
2) Insect bites (bedbugs/fleas)
- Often appear in lines or clusters
- Very itchy
- May show up after sleep or exposure to infested areas
3) Skin irritation or friction
- From tight clothing, sweat, or rubbing
- Can cause patchy red bumps and itching
When to take this more urgently
He should get checked as soon as possible (today if you can) if:
- It’s clearly one-sided in a band or stripe
- There is burning or pain, not just itching
- Blisters are starting to form
- It’s spreading quickly
- He has fever or feels unwell
What to do right now
- Don’t scratch (can worsen irritation)
- Keep the area clean and dry
- Cool compresses may help itching
- Avoid applying random strong creams until a doctor sees it
If you can answer these, I can narrow it down more:
- Is it only on one side of his body?
- Are there blisters or just red bumps?
- Does it hurt or burn, or only itch?
