5 Seborrheic Keratosis Treatments You Sent Me - Ranked by Evidence

Key strategies & takeaways (ranked by home-attempt popularity vs. evidence)

Safety “non-negotiable” before any DIY

• Do not treat any spot that is new, changing, growing, itchy, or bleeding until it’s assessed by a dermatology professional (with a dermatoscope).
• Reminder: seborrheic keratoses are usually harmless, but not everything that looks like one is one.

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Evidence-based ranking of at-home treatments

5) Plasma/mole removal “zap” pens (arc/electrical devices) — avoid

• Why discouraged
  • Fires a hot electrical arc with unknown depth/control.
  • Risks scarring and permanent skin marks (lighter/darker discoloration).
  • Destroys evidence if the lesion isn’t actually seborrheic keratosis—could delay accurate diagnosis (sometimes requiring biopsy/surgery).

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4) Castor oil — low-risk “maybe,” but no clinical proof

• What people reported
  • Applying organic castor oil daily for ~4 weeks (some anecdotes of improvement/removal).
• Evidence
  • No clinical trials (no randomized controlled evidence).
• Wellness rationale / risk
  • Seen as cheap and relatively harmless compared with more aggressive methods.
• Practical caution
  • Downsides appear mainly to be messiness, not major chemical burns.

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3) Apple cider vinegar — may work but higher burn risk

• Why people think it works
  • Vinegar is an acid; acid can shift/burn off seborrheic keratoses.
• Why cautioned
  • Uncontrolled acid application can cause skin burns.
  • The video cites a medical case showing nasty burns from vinegar used under a plaster for extended contact.
• Risk control tips (implied)
  • Avoid near eyes (explicit “big no”).
  • Proceed cautiously since side effects vary (some reports of itchiness/regrowth).

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2) Fingernails / scraping / emery board (mechanical trauma at home) — works like clinic methods, but unsafe uncontrolled

• Why it can seem effective
  • Clinic methods use the same general concept: destroying the superficial lesion (e.g., curettage, cryotherapy, cautery).
• Why home versions are discouraged
  • At home you’re “working blind”:
    • may not remove fully
    • risk bleeding, infection, and scarring
  • Potential for wound marks to be worse than the original lesion.
• Bottom line
  • Clinically effective concept, but requires clean, controlled depth/technique.

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1) Hydrogen peroxide — best evidence, but the “right strength” matters

• What’s evidence-based
  • The closest to real medicine: 40% hydrogen peroxide is an approved treatment (trialed by applying it in clinic).
  • Reported trial outcomes:
    • ~25–33% cleared
    • ~50% clear or nearly clear
    • on the face, higher response: ~70% clear or nearly clear
• Why bathroom-bottle versions are problematic
  • Home products are typically 3–4% (sometimes up to ~7%).
  • The video stresses there was no trial of the lower-strength OTC use.
• Access note
  • The licensed 40% product was pulled from market (2019), so the “best evidence” option may be unavailable.
• Practical implication
  • It may help for some, but home dosing is essentially guesswork, and near the eyes increases risk.

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Additional wellness/safety warning: diclofenac gel and pets

• Key safety strategy
  • Diclofenac (topical anti-inflammatory) is toxic to cats (cats can’t process it properly).
  • If using it and you have cats:
    • wear gloves
    • wash hands properly
    • cover treated areas
    • prevent pet contact (including from handling furniture where residue might be)
• Broader caution
  • Similar caution suggested for dogs.
  • If someone has kidney disease, heart trouble, or is on other anti-inflammatories, consult a clinician first—risk may be lower with topical use, but not zero.

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Productivity/behavioral “process” advice (how to think about these decisions)

• Evidence vs. “no evidence”
  • Lack of trials doesn’t always mean something “doesn’t work,” but it often means it was never studied.
• Don’t let optimism override risk
  • The host’s approach: if it seems to work and there are no red flags, that’s one thing—but avoid harm and avoid missing skin cancer.

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Clinical alternatives that reliably work (not DIY)

• “Unglamorous clinical stuff”
  • Freezing
  • Curettage
  • Laser
  • Cautery
• Outcomes referenced
  • Clears ~9 out of 10 lesions in one go
  • Recurrence ~6% in the first year

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Myths addressed (diet/insulin resistance & recurrence)

Sugar/insulin resistance

• Connection is solid for skin tags, but not supported as the cause for seborrheic keratoses.

Diet advice

• No universal diet—people respond differently (example given: keto vs carb intake for athletic training).

Do they come back?

• If fully removed: that lesion usually doesn’t return.
• New ones can appear over time as skin ages (removal doesn’t stop the “factory” that creates new lesions).

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Presenters / sources

• Presenter: Dr. Finbarr (GP specializing in skin)
• Referenced sources (as described in the subtitles):
  • Clinical trials of 40% hydrogen peroxide and regulatory decisions (FDA/“American regulator,” approval in 2017; product pulled from market in 2019)
  • Medical literature / case report of vinegar causing burns (5% vinegar used under plaster for ~8 hours)
  • Regulatory pet safety warning about diclofenac (cats; cases reported across households)