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

Inclusion Criteria:

1. Female and male patients ≥ 18 years of age
2. Clinical diagnosis of SMH with lesion of the face
3. Written informed consent obtained before any assessment is performed
4. Affiliation with a social security scheme
5. Physical and psychological ability to participate

Exclusion Criteria:

1. Use of systemic antibiotics or any systemic antifungal treatments within 4 weeks before the inclusion visit
2. Use of topical antibiotics or any topical antifungal treatments on the face within 2 weeks before the inclusion visit
3. Use of any topical cream, gel, serum or ointment within 2 days before the inclusion visit
4. Laser, radiofrequency, peeling or any other procedure on the face in the past 3 months before the inclusion visit
5. Vulnerable patients: minors, patients under guardianship or curatorship, pregnant or breast-feeding women