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Brief Title: Improvement of Pigmented Skin Lesions in Patients With Mastocytosis After Performing 2 Sessions of Pigment Laser
Official Title: Evaluation of the Improvement of Pigmented Skin Lesions in Patients With Mastocytosis After Performing 2 Sessions of Pigment Laser : Pilot Study Conducted at a Reference Centre Mastocytoses (LaserMasto)
Study ID: NCT04377828
Brief Summary: Cutaneous mastocytosis can be isolated or associated with systemic involvement. Urticaria pigmentosa affects around 80 to 85% of adult patients with cutaneous mastocytosis. It is also frequently present in patients with mastocytosis associated with systemic involvement (80% of patients in our experience). This skin damage is one of the causes of deterioration in quality of life in patients with mastocytosis, through the loss of self-esteem, due to the appearance of lesions. However there are not treatment for urticaria pigmentosa. Skin involvement in mastocytosis is linked to the accumulation of abnormal mast cells in the dermis. However, the mast cells are not pigmented and the brown-brown color characteristic of Urticaria pigmentosa is explained by melanin pigmentation of the epidermal basal layer.
Detailed Description: Cutaneous mastocytosis can be isolated or associated with systemic involvement. Urticaria pigmentosa affects around 80 to 85% of adult patients with cutaneous mastocytosis. It is also very frequently present in patients with mastocytosis associated with systemic involvement (80% of patients in our experience). This skin damage is one of the causes of deterioration in quality of life in patients with mastocytosis, through the loss of self-esteem, due to the appearance of lesions. However ,there is not a treatment for urticaria pigmentosa. Skin involvement in mastocytosis is linked to the accumulation of abnormal mast cells in the dermis. However, the mast cells are not pigmented and the brown-brown color characteristic of pigmentary urticaria is explained by melanin pigmentation of the epidermal basal layer. This characteristic is often described on skin biopsies of pigmentary urticaria analyzed in hematoxilin-eosin. The 532 nm Q-Switched laser is known to improve lesions characterized by the presence of melanin pigment in the basal layer of the epidermis, with very little risks. This later is explained by the reduced penetration of light at 532 nm into the skin and the emission time of the laser light which is very low (of the order of a few nanoseconds) for Q-Switched lasers. In the literature, 2 case reports report an efficiency of the laser at 532 nm in this indication in adults. The hypothesis of this study is that 2 sessions of Q-switched laser could improve the skin lesions of urticaria pigmentosa, leading to an improvement in self-esteem.
Minimum Age: 18 Years
Eligible Ages: ADULT, OLDER_ADULT
Sex: ALL
Healthy Volunteers: No
Larrey Hospital - Toulouse University Hospital, Toulouse, , France
Name: Christina BULAI LIVIDEANU, MD
Affiliation: Toulouse University Hospital
Role: PRINCIPAL_INVESTIGATOR