NCT06908889

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

• Status: Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 20 (estimated)
• Sponsor: Centre Hospitalier Universitaire de Nice · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Accepted

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

Conditions

• Hypopigmentation

Interventions

Type	Name	Description
OTHER	Skin's lesion patients	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.
OTHER	Skin's lesion vulunteers	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.

Timeline

• Start date: 2025-06-25
• Primary completion: 2026-01-25
• Completion: 2026-06-25
• First posted: 2025-04-03
• Last updated: 2025-07-01

Locations

3 sites across 1 country: France