5 citations,
June 2015 in “British Journal of Dermatology” A certain medication improved severe itching in a boy with liver and bowel disease by reducing histamine levels, suggesting a new treatment target.
February 2010 in “Journal of The American Academy of Dermatology” The study concluded that patients with total hair loss and recurring hair loss had an earlier onset, longer-lasting condition, and a greater negative impact on their quality of life, with allergic conditions linked to more severe hair loss.
11 citations,
March 2007 in “Digestive Diseases and Sciences” The conditions alopecia areata, primary sclerosing cholangitis, and ulcerative colitis may be linked by shared autoimmune and cell death mechanisms.
January 2004 in “Indian Journal of Nephrology” 
3 citations,
January 1988 in “PubMed” The review found that basal cell carcinomas on the scalp are not more aggressive than those in other locations.