Pigmented contact dermatitis with histology of lichenoid dermatitis: A reported case

Authors

  • Tanongkiet Tienthavorn INSTITUE OF DERMATOLOGY-MINISTRY OF PUBLIC HEALTH, BANGKOK, THAILAND
  • Poohglin Tresukosol INSTITUE OF DERMATOLOGY-MINISTRY OF PUBLIC HEALTH, BANGKOK, THAILAND

Keywords:

Pigmented contacted dermatitis, Ashy dermatitis, Lichen planus pigmentosus, patch test

Abstract

We report a case of 32-year-old female who developed hyperpigmented skin for 3 years. Skin lesions were generalized hyperpigmented macules and histological finding was licheniod dermatitis. Provisional diagnosis was lichen planus pigmentosus before closed patch test and photopatch test shown allergic contact dermatitis to fragrance mix II, cinnamic alcohol, cinnamic aldehyde, ylang ylang oil, and potassium dichromate . This patient was finally diagnosed as pigmented contact dermatitis. In conclusion, we believed that patch test should be performed in the case with LPP to identified the cause. Further study in a larger number of cases is required in Thailand to provide the exact causative factors of these skin diseases.

References

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Published

2026-06-10

How to Cite

Tienthavorn, T., & Tresukosol, P. (2026). Pigmented contact dermatitis with histology of lichenoid dermatitis: A reported case. Thai Journal of Dermatology, 28(2), 137–142. retrieved from https://he02.tci-thaijo.org/index.php/TJD/article/view/282916

Issue

Section

Case Report