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What to do if…
you develop blistering or peeling skin after starting a new medication

Short answer

Treat blistering or peeling skin after a new medication as an emergency: get urgent medical help now (999 or A&E). Do not take another dose unless an emergency clinician tells you to.

Do not do these things

  • Do not “wait and see” if skin is blistering, peeling, very painful, or you have sores in your mouth/eyes/genitals.
  • Do not take another dose of the new medication “to test it,” unless you are explicitly told to by the hospital team.
  • Do not try to treat this at home with leftover antibiotics, steroids, or someone else’s medicines.
  • Do not apply strong topical products (acid peels, retinoids, “burn” creams) to broken/blistered skin.
  • Do not start any new over-the-counter medicines or supplements (including cold/flu products) unless a clinician advises it.

What to do now

  1. Get urgent help immediately.
    • Call 999 if you have blistering/peeling, widespread rash, skin pain, fever, facial swelling, trouble breathing, confusion, or you feel rapidly worse.
    • Otherwise go to A&E now (do not drive yourself if you feel unwell or dizzy).
  2. Pause the suspected new medication until assessed.
    If the reaction began after starting a new medicine (or a recent dose increase), do not take another dose unless the emergency team instructs you to. (If you’re on a medicine where stopping suddenly can be risky—e.g., some seizure medicines—tell the emergency team immediately so they can manage this safely.)
  3. Bring the “evidence” with you (this helps doctors act fast).
    • Take the medication boxes/blister packs/bottles (including over-the-counter meds, herbals, and supplements).
    • Write down: name, dose, first day taken, last dose time, and any recent changes.
    • Note any recent infections/illnesses, and any previous drug reactions.
  4. Document what’s happening (quickly, calmly).
    Take a few clear photos in good light (wide shot + close-up), and note when symptoms started and how fast they’re spreading.
  5. Protect your skin while you travel.
    • Wear loose, soft clothing.
    • If areas are raw/oozing, cover lightly with a clean, non-stick dressing if you have one (don’t tape aggressively to fragile skin).
    • Avoid heat, friction, and sun on affected areas.
  6. Use NHS 111 only if symptoms are mild and not blistering/peeling.
    If there is any blistering/peeling, mouth/eye/genital sores, breathing symptoms, or you feel very unwell, do not rely on 111—use 999/A&E as above.

What can wait

  • You do not need to figure out “which condition this is” right now.
  • You do not need to decide today whether to restart, switch, or permanently stop any long-term medicines — the hospital team will guide next steps.
  • You do not need to write a detailed timeline beyond the key facts (start date, last dose time, first symptoms).
  • Once you’re safe and stable, you can tell your GP/pharmacy to record this as a suspected serious reaction and (if appropriate) report it via the MHRA Yellow Card scheme.

Important reassurance

This can be frightening, and it’s reasonable to feel panicked. Blistering or peeling after a new medication is uncommon, but when it happens it needs urgent hospital assessment—seeking help quickly is the right move.

Scope note

These are first steps to keep you safe and get you assessed quickly. Ongoing treatment and medication decisions should be made with your hospital team and usual prescriber.

Important note

This guide is general information, not a diagnosis. If you have blistering/peeling skin or sores in the mouth/eyes after starting a medicine, treat it as urgent and seek emergency care.

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