Diffuse dermographic mastocytosis without visible skin lesions

Area of Science:

• Dermatology
• Pediatrics
• Hematology

Background:

• Mastocytosis is a rare disorder characterized by the abnormal proliferation of mast cells.
• It can manifest in various forms, with or without skin involvement.
• Urticaria and dermographism are common dermatological symptoms that can be associated with mastocytosis.

Observation:

• A 3-year-old girl presented with a year-long history of urticaria and pressure dermographism.
• Initial presentation suggested chronic urticaria unresponsive to standard treatments.
• Skin biopsy was performed to investigate the persistent dermatological symptoms.

Findings:

• The skin biopsy confirmed the diagnosis of diffuse mastocytosis.
• The patient's mastocytosis presented without overt skin lesions, with urticaria and pressure-induced dermographism as the sole clinical signs.
• This specific presentation represents a subtype of mastocytosis.

Implications:

• The identification of mastocytosis presenting solely with dermographism and urticaria is clinically significant.
• This diagnosis should be considered in pediatric cases of chronic urticaria, especially those unresponsive to conventional therapies and appearing early in life.
• Prompt diagnosis and management can potentially improve patient outcomes and prevent disease progression.