My question is in regard to my son, 18 years old, who has had itching for the past 4 weeks without a rash. itching started in genital area, but jumps from different areas of his body at different times. recent blood work done in may of this year was norma

Many ideas: While there are many possibilities, the first thing that you might do is try changing your laundry detergent. This is surprisingly common as a cause of traveling itches. If this fails, and it's disabling, a dermatology consult is in order.

Mast cell fragility,: mast cell fragility is a condition where the mast cell ruptures easily. This problem of the cell rupture without a substantial slap or pressure to the skin can occur from a weakened mast cell wall or membrane. A deficiency in a biochemical needed to strengthen the cell membrane needs to be diagnosed and replaced. Chronic inflammation should be ruled out by your M.D. A trial of B-6,B