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    Did you mean Patch Testing?
    Glossary Patch 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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    1. Patch tests with commercial hair dye products in patients with allergic contact dermatitis to para-phenylenediamine Indian Journal of Dermatology Venereology and Leprology · 2016 · 6 citations
    2. Influence of Atopic Dermatitis on the Dermoscopic Phenotype of Positive Patch Test Reactions: A Prospective Comparative Study Life · 2026
    3. Patch test positive results in patients with biopsy‐proven central centrifugal cicatricial alopecia Journal of the European Academy of Dermatology and Venereology · 2024
    4. Common Allergens Identified Based on Patch Test Results in Patients with Suspected Contact Dermatitis of the Scalp Skin appendage disorders · 2016 · 16 citations
    5. Ethanol Patch Test—A Simple and Sensitive Method for Identifying ALDH Phenotype Alcoholism Clinical and Experimental Research · 1989 · 66 citations
    6. Analysis of Patch Testing for Allergic Contact Dermatitis in Adults Versus Geriatrics: A 7-Year Retrospective Analysis of 342 Positive Patch Test Cases Indian Journal of Dermatology · 2026
    7. Patchy hair loss on the pubis--a case study. PubMed · 2013 · 2 citations
    8. Loose anagen hair syndrome presenting as patchy hypotrichosis – clinico-trichoscopic correlation International Journal of Dermatology Research · 2026
    9. Gray Patch Tinea Capitis Caused by Microsporum canis Cermin Dunia Kedokteran · 2020 · 1 citations
    10. Non-scarring patchy alopecia in patients with systemic lupus erythematosus differs from that of alopecia areata Lupus · 2013 · 30 citations
    11. Alopecia: what to do when the endocrine skin tests are normal? British Small Animal Veterinary Association eBooks · 2021
    12. 55 cases of allergic reactions to hair dye: a descriptive, consumer complaint‐based study Contact Dermatitis · 2002 · 98 citations
    13. Contact dermatitis to Minoxidil Contact Dermatitis · 1985 · 34 citations
    14. Pustular allergic contact dermatitis from minoxidil Contact Dermatitis · 1998 · 17 citations
    15. Pigmented contact dermatitis from topical minoxidil 5% Contact Dermatitis · 2002 · 17 citations
    16. Scalp Psoriasiform Contact Dermatitis with Acute Telogen Effluvium due to Topical Minoxidil Treatment Skin appendage disorders · 2015 · 14 citations
    17. Topical minoxidil sensitization in androgenic alopecia Contact Dermatitis · 1987 · 14 citations
    18. Contact Dermatitis Caused by Topical Minoxidil: Case Reports and Review of the Literature American Journal of Contact Dermatitis · 1991 · 9 citations
    19. Videodermoscopy does not enhance diagnosis of scalp contact dermatitis due to topical minoxidil International Journal of Trichology · 2009 · 7 citations
    20. Allergic contact dermatitis of the scalp: a review of an underdiagnosed entity International Journal of Women’s Dermatology · 2024 · 5 citations
    21. Contact Dermatitis Caused by Topical Minoxidil: Case Reports and Review of the Literature Dermatitis · 1991 · 4 citations
    22. Acute Localized Exanthematous Pustulosis (ALEP) Caused by Topical Application of Minoxidil Journal of Clinical Medicine · 2023 · 1 citations
    23. Cutaneous drug reactions Elsevier eBooks · 2010 · 1 citations
    24. Two Cases of Allergic Contact Dermatitis to Hinokitiol and Pantothenylethylether in Hair Growth Promoter Skin research · 1997 · 1 citations
    25. Analysis of Common Treatment Drugs and Allergen Sensitization in Hair Loss Patients Journal of Cosmetic Dermatology · 2025
    26. A study of the effects of topical minoxidil in the treatment of androgenic alopecia using phototrichograms British Journal of Dermatology · 1989
    27. Contact sensitization to hair care allergens in scalp seborrheic dermatitis: associations with disease severity and microbiota profiles Frontiers in Allergy · 2026
    28. Allergic contact dermatitis to natural products Journal of The American Academy of Dermatology · 2017
    29. Allergic contact dermatitis produced by canrenone Contact Dermatitis · 2007
    30. How to Diagnose Hair Loss Dermatologic Clinics · 2012 · 27 citations