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GlossaryPatch Testing

diagnostic method to identify skin allergies to specific substances

Patch testing is a diagnostic procedure used to identify substances that cause allergic contact dermatitis. Small amounts of potential allergens are applied to patches, which are then placed on the skin, usually on the back, for 48 hours. The skin is examined for reactions at 48 hours and again at 72-96 hours to determine if an allergy is present.

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Research

5 / 1000+ results

research Patch tests with commercial hair dye products in patients with allergic contact dermatitis to para-phenylenediamine

6 citations , January 2016 in “Indian Journal of Dermatology Venereology and Leprology”

Most hair dyes can cause allergic reactions, so test before use.

research Influence of Atopic Dermatitis on the Dermoscopic Phenotype of Positive Patch Test Reactions: A Prospective Comparative Study

April 2026 in “Life”

Atopic dermatitis affects the appearance of skin reactions, making certain features more common and improving diagnostic accuracy with dermoscopy.

research Patch test positive results in patients with biopsy‐proven central centrifugal cicatricial alopecia

June 2024 in “Journal of the European Academy of Dermatology and Venereology”

Allergens might contribute to CCCA, so avoiding them could help manage the condition.

research Ethanol Patch Test—A Simple and Sensitive Method for Identifying ALDH Phenotype

66 citations , April 1989 in “Alcoholism Clinical and Experimental Research”

The ethanol patch test reliably identifies ALDH phenotype.

research Common Allergens Identified Based on Patch Test Results in Patients with Suspected Contact Dermatitis of the Scalp

16 citations , December 2016 in “Skin appendage disorders”

Nickel, cobalt, balsam of Peru, fragrance mix, carba mix, and propylene glycol are common allergens causing scalp contact dermatitis.

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community Is anybody here combining oral dutasteride with topical dutasteride?

in Finasteride/Dutasteride 9 upvotes 2 years ago

A user is considering combining oral and topical dutasteride to lower scalp DHT more effectively and is seeking advice on this approach. They are thinking about doing a patch test on their mid scalp.

community Ray Peat: Testosterone Isn’t the Culprit, Prolactin and Cortisol Drive Hair Loss (2016)

in Research/Science 110 upvotes 9 months ago

Prolactin and cortisol are identified as key factors in hair loss, with stress hormones impacting hair shedding. Finasteride and minoxidil are effective treatments, while DHT's role and individual sensitivity are significant factors.

community My Testosterone is less than 1/3rd In 7 Months since I took Finasteride!

in Finasteride/Dutasteride 117 upvotes 3 years ago

A user experienced a significant drop in testosterone levels after taking finasteride, leading to side effects like low libido and muscle mass loss. Despite its effectiveness for hair, the user decided to stop finasteride due to its impact on hormones, preferring to be bald.

community Take licorice to lower testosterone?

in Question 1 upvotes 9 years ago

Licorice is not recommended for hair loss as it inhibits hair growth and is a non-selective testosterone inhibitor. Alternatives like spironolactone are suggested for those considering hormonal treatments for hair loss.

community Testosterone is 1600, would taking low dose anti-androgens be a viable treatment option for people who’s T spikes on DHT-blockers?

in Treatment 46 upvotes 2 years ago

The post and conversation are about the user's high testosterone levels and their worsening hair loss despite trying various treatments. They are considering using low doses of anti-androgens to lower their testosterone levels as a potential solution.

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