Biobanking for Biomarkers In Respiratory Disease, Allergic Diseases and/or Mast Cell Disorders

This study is building a collection of blood and tissue samples (a biobank) from patients with allergic conditions, asthma, or mast cell disorders to help researchers better understand these diseases and develop new treatments. **You may be eligible if...** - You have a positive allergy skin test or blood test (specific IgE), or are being evaluated for allergies - You have been diagnosed with mastocytosis (a condition where too many mast cells accumulate in the body) - You have mast cell activation syndrome - You have a rare inherited condition called familial hyper-alpha tryptasemia - You have asthma of any severity - You are enrolled in a social security scheme **You may NOT be eligible if...** - You do not meet any of the above criteria - You are unable to understand or consent to the study Talk to your doctor to see if this trial is right for you.