I have a first cousin with mastocytosis. I have redness and pain if pressure is applied to my skin. If I wear tight or snug clothing I have pain(and nausea if it is near my mid section.) These symptoms are better if I take antihistamines. Having a blood pressure reading or a mammogram are very painful. Do I have mastocytosis. I am 52 but began with these symptoms on a lesser scale at least ten years ago.