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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 testing with hair cosmetic series in Europe: a critical review and recommendation

47 citations , June 2015 in “Contact Dermatitis”

A standardized patch test for hair cosmetics is needed in Europe to prevent allergies, especially for hairdressers.

research Patch testing and contact allergen avoidance in patients with lichen planopilaris and/or frontal fibrosing alopecia: A cohort study

35 citations , January 2020 in “Journal of the American Academy of Dermatology”

Avoiding certain allergens in personal care products may improve symptoms for some patients with lichen planopilaris or frontal fibrosing alopecia.

research Photopatch and patch testing in 63 patients with frontal fibrosing alopecia: a case series

24 citations , July 2018 in “British Journal of Dermatology”

Contact allergies might contribute to frontal fibrosing alopecia.

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.

research Patch Testing in Allergic Contact Dermatitis from Minoxidil

11 citations , July 2010 in “Dermatitis”

Patch testing helps find allergens in minoxidil treatments, but doesn't ensure alternatives will be tolerated.

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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 in Reference Range Doesn't Cause Hair Loss

in Research/Science 53 upvotes 2 years ago

Testosterone within the normal range does not significantly contribute to male pattern baldness (MPB); DHT is the main factor that can be controlled. Genetics play a crucial role in hair loss, and treatments like finasteride and dutasteride, which block DHT, can help despite potentially raising testosterone levels.

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