Characterization of Bacterial and Mycosis Skin Flora in Seborrheic Macular Hypopigmentation - Microbiome
Characterization of Bacterial and Mycosis Skin Flora in Seborrheic Macular Hypopigmentation - Microbiome_SHM
Centre Hospitalier Universitaire de Nice
20 participants
Jun 25, 2025
INTERVENTIONAL
Conditions
Summary
Hypopigmented skin changes are commonly encountered by dermatologists. A new dermatological entity was identified as scattered, hypopigmented oval-shaped macules and patches distributed mostly in seborrheic area of the face and of the trunk in dark skinned individuals. This patterned presentation of hypopigmentation was first described in the literature under the name of hypochromic vitiligo or vitiligo minor. Nerveless, histopathological patient's specimens analyzed by Krueger et al. clearly highlight that there is no tangible causal correlation with a diagnosis of vitiligo. They propose to rename this entity to Seborrheic Macular Hypopigmentation (SMH). The etiopathology of this dermatosis is still unknown preventing to propose any satisfactory treatment for this disfiguring affection.The objective of this study is to analyze the bacterial and fungal skin microbiome on hypochromic lesions of SMH compared to the surrounding non-lesional skin of the same patients and to healthy volunteers
Eligibility
Inclusion Criteria5
- Female and male patients ≥ 18 years of age
- Clinical diagnosis of SMH with lesion of the face
- Written informed consent obtained before any assessment is performed
- Affiliation with a social security scheme
- Physical and psychological ability to participate
Exclusion Criteria5
- Use of systemic antibiotics or any systemic antifungal treatments within 4 weeks before the inclusion visit
- Use of topical antibiotics or any topical antifungal treatments on the face within 2 weeks before the inclusion visit
- Use of any topical cream, gel, serum or ointment within 2 days before the inclusion visit
- Laser, radiofrequency, peeling or any other procedure on the face in the past 3 months before the inclusion visit
- Vulnerable patients: minors, patients under guardianship or curatorship, pregnant or breast-feeding women
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Interventions
Skin swabs will be obtained from the patient's facial lesional (FLS) and perilesional sites (FPS) using a sterile cotton swab. The microbiota of the same anatomical face regions will be collected on volunteers, once the 10 SMH patients have been enrolled. The swab is premoistened in a specific cocktail solution and rubbed onto the skin surface for 45sec. The pressure during the sampling involves rubbing the area of interest with a smear over the entire zone. The skin reddens slightly under the exerted pressure.
Skin swabs will be obtained from the patient's facial lesional (FLS) and perilesional sites (FPS) using a sterile cotton swab. The microbiota of the same anatomical face regions will be collected on volunteers, once the 10 SMH patients have been enrolled. The swab is premoistened in a specific cocktail solution and rubbed onto the skin surface for 45sec. The pressure during the sampling involves rubbing the area of interest with a smear over the entire zone. The skin reddens slightly under the exerted pressure.
Locations(3)
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NCT06908889