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Minocycline-induced skin pigmentation: an update
Aanand N Geria1, Ani L Tajirian, George Kihiczak
1Dermatology, New Jersey Medical School, Newark, NJ 07103-2714, USA.
Acta Dermatovenerologica Croatica : ADC
|July 15, 2009
Summary
Minocycline antibiotic treatment for acne can cause skin pigmentation. Types I and II pigmentation resolve slowly, while Type III is permanent, requiring sun protection and laser therapy.
Area of Science:
- Dermatology
- Pharmacology
Background:
- Minocycline is a tetracycline antibiotic frequently prescribed for acne vulgaris.
- Skin pigmentation is a known, cosmetically concerning side effect of long-term minocycline use.
Purpose of the Study:
- To describe the distinct types of minocycline-induced skin pigmentation.
- To investigate the histological characteristics and potential etiologies of these pigmentations.
- To outline management strategies for minocycline-associated skin discoloration.
Main Methods:
- Clinical observation of three pigmentation types.
- Histopathological examination including iron and melanin staining.
- Comparison with other tetracyclines and treatment outcomes.
Main Results:
- Type I: blue-black/grey pigment on acne-scarred/inflamed facial skin.
- Type II: blue-grey pigment on normal skin of shins/forearms.
- Type III: diffuse muddy-brown discoloration in sun-exposed areas.
- Types I & II show extracellular iron and melanin in dermis/macrophages.
- Type III shows increased basal keratinocyte and dermal melanophage melanin.
Conclusions:
- Minocycline-induced pigmentation presents in three distinct clinical and histological patterns.
- Etiology may involve reactive metabolites or chelation products, with longer treatment durations potentially contributing.
- Types I and II pigmentation may resolve over time, but Type III is persistent.
- Management includes early detection, drug cessation, sun protection, and laser treatment for refractory cases.
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